21021012112210 has 32 divisors (see below), whose sum is σ = 42609160041984. Its totient is φ = 7397423616000.

The previous prime is 21021012112171. The next prime is 21021012112229. The reversal of 21021012112210 is 1221121012012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3082256431 + ... + 3082263250.

It is an arithmetic number, because the mean of its divisors is an integer number (1331536251312).

Almost surely, 2^{21021012112210} is an apocalyptic number.

21021012112210 is an abundant number, since it is smaller than the sum of its proper divisors (21588147929774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021012112210 is a wasteful number, since it uses less digits than its factorization.

21021012112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6164519730.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021012112210 its reverse (1221121012012), we get a palindrome (22242133124222).

The spelling of 21021012112210 in words is "twenty-one trillion, twenty-one billion, twelve million, one hundred twelve thousand, two hundred ten".