21322357536 has 48 divisors (see below), whose sum is σ = 58917045600. Its totient is φ = 6733375488.

The previous prime is 21322357501. The next prime is 21322357607. The reversal of 21322357536 is 63575322312.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 21322357494 and 21322357503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5843121 + ... + 5846768.

It is an arithmetic number, because the mean of its divisors is an integer number (1227438450).

Almost surely, 2^21322357536 is an apocalyptic number.

It is an amenable number.

21322357536 is an abundant number, since it is smaller than the sum of its proper divisors (37594688064).

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

21322357536 is a wasteful number, since it uses less digits than its factorization.

21322357536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689921 (or 11689913 counting only the distinct ones).

The product of its digits is 226800, while the sum is 39.

Adding to 21322357536 its reverse (63575322312), we get a palindrome (84897679848).

The spelling of 21322357536 in words is "twenty-one billion, three hundred twenty-two million, three hundred fifty-seven thousand, five hundred thirty-six".