21252900 has 36 divisors (see below), whose sum is σ = 61492592. Its totient is φ = 5667360.

The previous prime is 21252899. The next prime is 21252919. The reversal of 21252900 is 925212.

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, 35122 + ... + 35721.

Almost surely, 2^21252900 is an apocalyptic number.

21252900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21252900 is an abundant number, since it is smaller than the sum of its proper divisors (40239692).

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

21252900 is a wasteful number, since it uses less digits than its factorization.

21252900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70860 (or 70853 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 21252900 is about 4610.0867670793. The cubic root of 21252900 is about 276.9955122716.

The spelling of 21252900 in words is "twenty-one million, two hundred fifty-two thousand, nine hundred".