21560800725 has 72 divisors (see below), whose sum is σ = 40192795552. Its totient is φ = 11457547200.

The previous prime is 21560800721. The next prime is 21560800823. The reversal of 21560800725 is 52700806512.

It is a happy number.

21560800725 is a `hidden beast` number, since 21 + 5 + 608 + 0 + 0 + 7 + 25 = 666.

It is not a de Polignac number, because 21560800725 - 2² = 21560800721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21560800725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21560800721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1712955 + ... + 1725495.

Almost surely, 2^21560800725 is an apocalyptic number.

21560800725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21560800725 is a deficient number, since it is larger than the sum of its proper divisors (18631994827).

21560800725 is a wasteful number, since it uses less digits than its factorization.

21560800725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12849 (or 12832 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 21560800725 in words is "twenty-one billion, five hundred sixty million, eight hundred thousand, seven hundred twenty-five".