21204541560 has 32 divisors (see below), whose sum is σ = 63613625040. Its totient is φ = 5654544384.

The previous prime is 21204541543. The next prime is 21204541571. The reversal of 21204541560 is 6514540212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 88352137 + ... + 88352376.

Almost surely, 2^21204541560 is an apocalyptic number.

21204541560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21204541560 is an abundant number, since it is smaller than the sum of its proper divisors (42409083480).

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

21204541560 is a wasteful number, since it uses less digits than its factorization.

21204541560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176704527 (or 176704523 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 21204541560 in words is "twenty-one billion, two hundred four million, five hundred forty-one thousand, five hundred sixty".