21601400 has 24 divisors (see below), whose sum is σ = 50223720. Its totient is φ = 8640480.

The previous prime is 21601397. The next prime is 21601417. The reversal of 21601400 is 410612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53804 + ... + 54203.

It is an arithmetic number, because the mean of its divisors is an integer number (2092655).

Almost surely, 2^21601400 is an apocalyptic number.

21601400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21601400 is an abundant number, since it is smaller than the sum of its proper divisors (28622320).

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

21601400 is a wasteful number, since it uses less digits than its factorization.

21601400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108023 (or 108014 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21601400 is about 4647.7306290275. The cubic root of 21601400 is about 278.5013467612.

The spelling of 21601400 in words is "twenty-one million, six hundred one thousand, four hundred".