21002112212210 has 8 divisors (see below), whose sum is σ = 37803801981996. Its totient is φ = 8400844884880.

The previous prime is 21002112212209. The next prime is 21002112212261. The reversal of 21002112212210 is 1221221120012.

It can be written as a sum of positive squares in 2 ways, for example, as 20998857167401 + 3255044809 = 4582451^2 + 57053^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050105610601 + ... + 1050105610620.

Almost surely, 2^{21002112212210} is an apocalyptic number.

21002112212210 is a deficient number, since it is larger than the sum of its proper divisors (16801689769786).

21002112212210 is a wasteful number, since it uses less digits than its factorization.

21002112212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100211221228.

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

Adding to 21002112212210 its reverse (1221221120012), we get a palindrome (22223333332222).

The spelling of 21002112212210 in words is "twenty-one trillion, two billion, one hundred twelve million, two hundred twelve thousand, two hundred ten".