21131424040044 has 48 divisors (see below), whose sum is σ = 52207378167168. Its totient is φ = 6629424392448.

The previous prime is 21131424039983. The next prime is 21131424040127. The reversal of 21131424040044 is 44004042413112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21131424039993 and 21131424040020.

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, 53889739 + ... + 54280445.

It is an arithmetic number, because the mean of its divisors is an integer number (1087653711816).

Almost surely, 2^{21131424040044} is an apocalyptic number.

It is an amenable number.

21131424040044 is an abundant number, since it is smaller than the sum of its proper divisors (31075954127124).

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

21131424040044 is a wasteful number, since it uses less digits than its factorization.

21131424040044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655854 (or 655852 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 30.

Adding to 21131424040044 its reverse (44004042413112), we get a palindrome (65135466453156).

The spelling of 21131424040044 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred twenty-four million, forty thousand, forty-four".