21213560331404 has 12 divisors (see below), whose sum is σ = 42427120662864. Its totient is φ = 9091525856304.

The previous prime is 21213560331389. The next prime is 21213560331427. The reversal of 21213560331404 is 40413306531212.

21213560331404 is an admirable number.

It is a super-2 number, since 2×21213560331404² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378813577319 + ... + 378813577374.

It is an arithmetic number, because the mean of its divisors is an integer number (3535593388572).

Almost surely, 2^{21213560331404} is an apocalyptic number.

It is an amenable number.

21213560331404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21213560331404 is a wasteful number, since it uses less digits than its factorization.

21213560331404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757627154704 (or 757627154702 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 21213560331404 its reverse (40413306531212), we get a palindrome (61626866862616).

The spelling of 21213560331404 in words is "twenty-one trillion, two hundred thirteen billion, five hundred sixty million, three hundred thirty-one thousand, four hundred four".