21523502794444 has 48 divisors (see below), whose sum is σ = 43510840708608. Its totient is φ = 9125154263808.

The previous prime is 21523502794411. The next prime is 21523502794471. The reversal of 21523502794444 is 44449720532512.

It is a super-2 number, since 2×21523502794444² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21523502794391 and 21523502794400.

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, 1209229 + ... + 6671524.

It is an arithmetic number, because the mean of its divisors is an integer number (906475848096).

Almost surely, 2^{21523502794444} is an apocalyptic number.

It is an amenable number.

21523502794444 is an abundant number, since it is smaller than the sum of its proper divisors (21987337914164).

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

21523502794444 is a wasteful number, since it uses less digits than its factorization.

21523502794444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7881814 (or 7881812 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 52.

The spelling of 21523502794444 in words is "twenty-one trillion, five hundred twenty-three billion, five hundred two million, seven hundred ninety-four thousand, four hundred forty-four".