21320857494720 has 168 divisors, whose sum is σ = 83811275612064. Its totient is φ = 4873338851328.

The previous prime is 21320857494709. The next prime is 21320857494757. The reversal of 21320857494720 is 2749475802312.

21320857494720 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 0 + 8 + 574 + 9 + 47 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 528770949 + ... + 528811268.

It is an arithmetic number, because the mean of its divisors is an integer number (498876640548).

Almost surely, 2^{21320857494720} is an apocalyptic number.

21320857494720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320857494720 is an abundant number, since it is smaller than the sum of its proper divisors (62490418117344).

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

21320857494720 is a wasteful number, since it uses less digits than its factorization.

21320857494720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057582247 (or 1057582234 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 21320857494720 in words is "twenty-one trillion, three hundred twenty billion, eight hundred fifty-seven million, four hundred ninety-four thousand, seven hundred twenty".