21221101102012 has 24 divisors (see below), whose sum is σ = 43811305502720. Its totient is φ = 8801378336880.

The previous prime is 21221101102007. The next prime is 21221101102049. The reversal of 21221101102012 is 21020110112212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12224135712 + ... + 12224137447.

Almost surely, 2^{21221101102012} is an apocalyptic number.

It is an amenable number.

21221101102012 is an abundant number, since it is smaller than the sum of its proper divisors (22590204400708).

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

21221101102012 is a wasteful number, since it uses less digits than its factorization.

21221101102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24448273201 (or 24448273199 counting only the distinct ones).

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

Adding to 21221101102012 its reverse (21020110112212), we get a palindrome (42241211214224).

The spelling of 21221101102012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, one hundred two thousand, twelve".