21603350400 has 96 divisors (see below), whose sum is σ = 71156067000. Its totient is φ = 5760890880.

The previous prime is 21603350383. The next prime is 21603350479. The reversal of 21603350400 is 405330612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1115575 + ... + 1134774.

Almost surely, 2^21603350400 is an apocalyptic number.

21603350400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21603350400 is an abundant number, since it is smaller than the sum of its proper divisors (49552716600).

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

21603350400 is a wasteful number, since it uses less digits than its factorization.

21603350400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250376 (or 2250359 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The spelling of 21603350400 in words is "twenty-one billion, six hundred three million, three hundred fifty thousand, four hundred".