21457300 has 36 divisors (see below), whose sum is σ = 46815580. Its totient is φ = 8536320.

The previous prime is 21457279. The next prime is 21457307. The reversal of 21457300 is 375412.

It can be written as a sum of positive squares in 6 ways, for example, as 535824 + 20921476 = 732^2 + 4574^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21457307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22432 + ... + 23368.

Almost surely, 2^21457300 is an apocalyptic number.

21457300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21457300 is an abundant number, since it is smaller than the sum of its proper divisors (25358280).

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

21457300 is a wasteful number, since it uses less digits than its factorization.

21457300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180 (or 1173 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21457300 is about 4632.2024998914. The cubic root of 21457300 is about 277.8806830583.

The spelling of 21457300 in words is "twenty-one million, four hundred fifty-seven thousand, three hundred".