21043551300 has 72 divisors (see below), whose sum is σ = 62985552000. Its totient is φ = 5418107520.

The previous prime is 21043551233. The next prime is 21043551301. The reversal of 21043551300 is 315534012.

It is not an unprimeable number, because it can be changed into a prime (21043551301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1200700 + ... + 1218099.

Almost surely, 2^21043551300 is an apocalyptic number.

21043551300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21043551300 is an abundant number, since it is smaller than the sum of its proper divisors (41942000700).

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

21043551300 is a wasteful number, since it uses less digits than its factorization.

21043551300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2418845 (or 2418838 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 21043551300 in words is "twenty-one billion, forty-three million, five hundred fifty-one thousand, three hundred".