21124492800 has 120 divisors (see below), whose sum is σ = 69783568536. Its totient is φ = 5633187840.

The previous prime is 21124492799. The next prime is 21124492801. The reversal of 21124492800 is 829442112.

It is an interprime number because it is at equal distance from previous prime (21124492799) and next prime (21124492801).

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124492801) 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, 236659 + ... + 313458.

Almost surely, 2^21124492800 is an apocalyptic number.

21124492800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124492800 is an abundant number, since it is smaller than the sum of its proper divisors (48659075736).

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

21124492800 is an equidigital number, since it uses as much as digits as its factorization.

21124492800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550148 (or 550127 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 21124492800 in words is "twenty-one billion, one hundred twenty-four million, four hundred ninety-two thousand, eight hundred".