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212212012121 = 747728381973
BaseRepresentation
bin1100010110100011010…
…0100101010001011001
3202021202102100011210122
43011220310211101121
511434102233341441
6241253331523025
721221545224614
oct3055064452131
9667672304718
10212212012121
1181aa916a6aa
1235165459475
131701c385655
14a3b1d2b17b
1557c062334b
hex3168d25459

212212012121 has 4 divisors (see below), whose sum is σ = 212240401572. Its totient is φ = 212183622672.

The previous prime is 212212012099. The next prime is 212212012151. The reversal of 212212012121 is 121210212212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165294286096 + 46917726025 = 406564^2 + 216605^2 .

It is a cyclic number.

It is not a de Polignac number, because 212212012121 - 26 = 212212012057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212212012121.

It is not an unprimeable number, because it can be changed into a prime (212212012151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14183510 + ... + 14198463.

It is an arithmetic number, because the mean of its divisors is an integer number (53060100393).

Almost surely, 2212212012121 is an apocalyptic number.

It is an amenable number.

212212012121 is a deficient number, since it is larger than the sum of its proper divisors (28389451).

212212012121 is an equidigital number, since it uses as much as digits as its factorization.

212212012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28389450.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212212012121 its reverse (121210212212), we get a palindrome (333422224333).

The spelling of 212212012121 in words is "two hundred twelve billion, two hundred twelve million, twelve thousand, one hundred twenty-one".

Divisors: 1 7477 28381973 212212012121