21247076400 has 120 divisors (see below), whose sum is σ = 74248920384. Its totient is φ = 5150803200.

The previous prime is 21247076327. The next prime is 21247076437. The reversal of 21247076400 is 467074212.

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

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 791614 + ... + 818013.

Almost surely, 2^21247076400 is an apocalyptic number.

21247076400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21247076400 is an abundant number, since it is smaller than the sum of its proper divisors (53001843984).

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

21247076400 is a wasteful number, since it uses less digits than its factorization.

21247076400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609659 (or 1609648 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The spelling of 21247076400 in words is "twenty-one billion, two hundred forty-seven million, seventy-six thousand, four hundred".