21403642700560 has 40 divisors (see below), whose sum is σ = 49911135422616. Its totient is φ = 8536052152320.

The previous prime is 21403642700519. The next prime is 21403642700597. The reversal of 21403642700560 is 6500724630412.

It can be written as a sum of positive squares in 4 ways, for example, as 3998192204304 + 17405450496256 = 1999548^2 + 4171984^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 396924871 + ... + 396978790.

Almost surely, 2^{21403642700560} is an apocalyptic number.

21403642700560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21403642700560 is an abundant number, since it is smaller than the sum of its proper divisors (28507492722056).

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

21403642700560 is a wasteful number, since it uses less digits than its factorization.

21403642700560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793904011 (or 793904005 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 21403642700560 in words is "twenty-one trillion, four hundred three billion, six hundred forty-two million, seven hundred thousand, five hundred sixty".