21221010221012 has 24 divisors (see below), whose sum is σ = 43075483437504. Its totient is φ = 8958976595712.

The previous prime is 21221010221009. The next prime is 21221010221053. The reversal of 21221010221012 is 21012201012212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5655917693 + ... + 5655921444.

It is an arithmetic number, because the mean of its divisors is an integer number (1794811809896).

Almost surely, 2^{21221010221012} is an apocalyptic number.

It is an amenable number.

21221010221012 is an abundant number, since it is smaller than the sum of its proper divisors (21854473216492).

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

21221010221012 is a wasteful number, since it uses less digits than its factorization.

21221010221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11311839215 (or 11311839213 counting only the distinct ones).

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

Adding to 21221010221012 its reverse (21012201012212), we get a palindrome (42233211233224).

The spelling of 21221010221012 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, two hundred twenty-one thousand, twelve".