21210012202112 has 32 divisors (see below), whose sum is σ = 42260403589500. Its totient is φ = 10603479536640.

The previous prime is 21210012202111. The next prime is 21210012202157. The reversal of 21210012202112 is 21120221001212.

It can be written as a sum of positive squares in 2 ways, for example, as 18886533906496 + 2323478295616 = 4345864^2 + 1524296^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21210012202112² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21210012202111) 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, 11033339 + ... + 12812282.

Almost surely, 2^{21210012202112} is an apocalyptic number.

It is an amenable number.

21210012202112 is a deficient number, since it is larger than the sum of its proper divisors (21050391387388).

21210012202112 is an equidigital number, since it uses as much as digits as its factorization.

21210012202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23852584 (or 23852572 counting only the distinct ones).

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

Adding to 21210012202112 its reverse (21120221001212), we get a palindrome (42330233203324).

The spelling of 21210012202112 in words is "twenty-one trillion, two hundred ten billion, twelve million, two hundred two thousand, one hundred twelve".