21643919634360 has 64 divisors (see below), whose sum is σ = 65527463152800. Its totient is φ = 5718760413696.

The previous prime is 21643919634341. The next prime is 21643919634409. The reversal of 21643919634360 is 6343691934612.

It is a self number, because there is not a number n which added to its sum of digits gives 21643919634360.

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, 827353879 + ... + 827380038.

Almost surely, 2^{21643919634360} is an apocalyptic number.

21643919634360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21643919634360 is an abundant number, since it is smaller than the sum of its proper divisors (43883543518440).

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

21643919634360 is a wasteful number, since it uses less digits than its factorization.

21643919634360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654734040 (or 1654734036 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 57.

The spelling of 21643919634360 in words is "twenty-one trillion, six hundred forty-three billion, nine hundred nineteen million, six hundred thirty-four thousand, three hundred sixty".