21313653629880 has 32 divisors (see below), whose sum is σ = 63940960890000. Its totient is φ = 5683640967936.

The previous prime is 21313653629867. The next prime is 21313653629899. The reversal of 21313653629880 is 8892635631312.

It is a self number, because there is not a number n which added to its sum of digits gives 21313653629880.

It is a congruent number.

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, 88806890005 + ... + 88806890244.

Almost surely, 2^{21313653629880} is an apocalyptic number.

21313653629880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313653629880 is an abundant number, since it is smaller than the sum of its proper divisors (42627307260120).

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

21313653629880 is a wasteful number, since it uses less digits than its factorization.

21313653629880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177613780263 (or 177613780259 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 57.

The spelling of 21313653629880 in words is "twenty-one trillion, three hundred thirteen billion, six hundred fifty-three million, six hundred twenty-nine thousand, eight hundred eighty".