21421554200 has 24 divisors (see below), whose sum is σ = 49805113980. Its totient is φ = 8568621600.

The previous prime is 21421554181. The next prime is 21421554211. The reversal of 21421554200 is 245512412.

It is a self number, because there is not a number n which added to its sum of digits gives 21421554200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53553686 + ... + 53554085.

Almost surely, 2^21421554200 is an apocalyptic number.

21421554200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421554200 is an abundant number, since it is smaller than the sum of its proper divisors (28383559780).

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

21421554200 is a wasteful number, since it uses less digits than its factorization.

21421554200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107107787 (or 107107778 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 21421554200 in words is "twenty-one billion, four hundred twenty-one million, five hundred fifty-four thousand, two hundred".