21352506366 has 32 divisors (see below), whose sum is σ = 44706993408. Its totient is φ = 6785856000.

The previous prime is 21352506359. The next prime is 21352506391. The reversal of 21352506366 is 66360525312.

It is a super-2 number, since 2×21352506366² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 209635 + ... + 294366.

It is an arithmetic number, because the mean of its divisors is an integer number (1397093544).

Almost surely, 2^21352506366 is an apocalyptic number.

21352506366 is an abundant number, since it is smaller than the sum of its proper divisors (23354487042).

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

21352506366 is a wasteful number, since it uses less digits than its factorization.

21352506366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504336.

The product of its (nonzero) digits is 194400, while the sum is 39.

The spelling of 21352506366 in words is "twenty-one billion, three hundred fifty-two million, five hundred six thousand, three hundred sixty-six".