21221000102012 has 24 divisors (see below), whose sum is σ = 37652891788512. Its totient is φ = 10463885913600.

The previous prime is 21221000101993. The next prime is 21221000102017. The reversal of 21221000102012 is 21020100012212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221000102017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106762289 + ... + 106960872.

It is an arithmetic number, because the mean of its divisors is an integer number (1568870491188).

Almost surely, 2^{21221000102012} is an apocalyptic number.

It is an amenable number.

21221000102012 is a deficient number, since it is larger than the sum of its proper divisors (16431891686500).

21221000102012 is a wasteful number, since it uses less digits than its factorization.

21221000102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213723509 (or 213723507 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221000102012 its reverse (21020100012212), we get a palindrome (42241100114224).

The spelling of 21221000102012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two thousand, twelve".