21313666352 has 20 divisors (see below), whose sum is σ = 45049340616. Its totient is φ = 9688030080.

The previous prime is 21313666327. The next prime is 21313666373. The reversal of 21313666352 is 25366631312.

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, 60550013 + ... + 60550364.

Almost surely, 2^21313666352 is an apocalyptic number.

21313666352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21313666352 is an abundant number, since it is smaller than the sum of its proper divisors (23735674264).

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

21313666352 is a wasteful number, since it uses less digits than its factorization.

21313666352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121100396 (or 121100390 counting only the distinct ones).

The product of its digits is 116640, while the sum is 38.

The spelling of 21313666352 in words is "twenty-one billion, three hundred thirteen million, six hundred sixty-six thousand, three hundred fifty-two".