21020001111212 has 48 divisors (see below), whose sum is σ = 38843610559488. Its totient is φ = 9941706046080.

The previous prime is 21020001111191. The next prime is 21020001111359. The reversal of 21020001111212 is 21211110002012.

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, 11918408 + ... + 13567919.

It is an arithmetic number, because the mean of its divisors is an integer number (809241886656).

Almost surely, 2^{21020001111212} is an apocalyptic number.

It is an amenable number.

21020001111212 is a deficient number, since it is larger than the sum of its proper divisors (17823609448276).

21020001111212 is a wasteful number, since it uses less digits than its factorization.

21020001111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25486526 (or 25486524 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21020001111212 its reverse (21211110002012), we get a palindrome (42231111113224).

The spelling of 21020001111212 in words is "twenty-one trillion, twenty billion, one million, one hundred eleven thousand, two hundred twelve".