21259852800 has 132 divisors (see below), whose sum is σ = 70265174616. Its totient is φ = 5669273600.

The previous prime is 21259852781. The next prime is 21259852807. The reversal of 21259852800 is 825895212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21259852807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61611 + ... + 215210.

Almost surely, 2^21259852800 is an apocalyptic number.

21259852800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21259852800 is an abundant number, since it is smaller than the sum of its proper divisors (49005321816).

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

21259852800 is a wasteful number, since it uses less digits than its factorization.

21259852800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276854 (or 276831 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 42.

The spelling of 21259852800 in words is "twenty-one billion, two hundred fifty-nine million, eight hundred fifty-two thousand, eight hundred".