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2121120101 = 7129874931
BaseRepresentation
bin111111001101101…
…1011100101100101
312110211021001202202
41332123123211211
513321001320401
6550250544245
7103364136422
oct17633334545
95424231682
102121120101
11999353a21
124b2438085
1327a5a4069
141619c6d49
15c633a06b
hex7e6db965

2121120101 has 4 divisors (see below), whose sum is σ = 2150995104. Its totient is φ = 2091245100.

The previous prime is 2121120061. The next prime is 2121120137. The reversal of 2121120101 is 1010211212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-2121120101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121120301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14937395 + ... + 14937536.

It is an arithmetic number, because the mean of its divisors is an integer number (537748776).

Almost surely, 22121120101 is an apocalyptic number.

It is an amenable number.

2121120101 is a deficient number, since it is larger than the sum of its proper divisors (29875003).

2121120101 is an equidigital number, since it uses as much as digits as its factorization.

2121120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29875002.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2121120101 is about 46055.6196462495. The cubic root of 2121120101 is about 1284.8578627222.

Adding to 2121120101 its reverse (1010211212), we get a palindrome (3131331313).

The spelling of 2121120101 in words is "two billion, one hundred twenty-one million, one hundred twenty thousand, one hundred one".

Divisors: 1 71 29874931 2121120101