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212021121021 = 370673707007
BaseRepresentation
bin1100010101110101110…
…0011000111111111101
3202021021010010220102220
43011131130120333331
511433204401333041
6241222352235553
721214036536033
oct3053534307775
9667233126386
10212021121021
1181a10439366
123511153bbb9
1316cbb96a438
14a39483a553
1557ad9b7d66
hex315d718ffd

212021121021 has 4 divisors (see below), whose sum is σ = 282694828032. Its totient is φ = 141347414012.

The previous prime is 212021121001. The next prime is 212021121047. The reversal of 212021121021 is 120121120212.

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 not a de Polignac number, because 212021121021 - 210 = 212021119997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021121001) 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, 35336853501 + ... + 35336853506.

It is an arithmetic number, because the mean of its divisors is an integer number (70673707008).

Almost surely, 2212021121021 is an apocalyptic number.

It is an amenable number.

212021121021 is a deficient number, since it is larger than the sum of its proper divisors (70673707011).

212021121021 is an equidigital number, since it uses as much as digits as its factorization.

212021121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70673707010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212021121021 its reverse (120121120212), we get a palindrome (332142241233).

The spelling of 212021121021 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, twenty-one".

Divisors: 1 3 70673707007 212021121021