21450600420 has 48 divisors (see below), whose sum is σ = 60077488128. Its totient is φ = 5718654720.

The previous prime is 21450600419. The next prime is 21450600461. The reversal of 21450600420 is 2400605412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192960 + ... + 283080.

It is an arithmetic number, because the mean of its divisors is an integer number (1251614336).

Almost surely, 2^21450600420 is an apocalyptic number.

21450600420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21450600420 is an abundant number, since it is smaller than the sum of its proper divisors (38626887708).

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

21450600420 is a wasteful number, since it uses less digits than its factorization.

21450600420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94100 (or 94098 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The spelling of 21450600420 in words is "twenty-one billion, four hundred fifty million, six hundred thousand, four hundred twenty".