21131012202224 has 20 divisors (see below), whose sum is σ = 40941722013720. Its totient is φ = 10565406521280.

The previous prime is 21131012202217. The next prime is 21131012202227. The reversal of 21131012202224 is 42220221013112.

It is a self number, because there is not a number n which added to its sum of digits gives 21131012202224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131012202227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4457894 + ... + 7882565.

It is an arithmetic number, because the mean of its divisors is an integer number (2047086100686).

Almost surely, 2^{21131012202224} is an apocalyptic number.

It is an amenable number.

21131012202224 is a deficient number, since it is larger than the sum of its proper divisors (19810709811496).

21131012202224 is a wasteful number, since it uses less digits than its factorization.

21131012202224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12447488 (or 12447482 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21131012202224 its reverse (42220221013112), we get a palindrome (63351233215336).

The spelling of 21131012202224 in words is "twenty-one trillion, one hundred thirty-one billion, twelve million, two hundred two thousand, two hundred twenty-four".