21492400 has 30 divisors (see below), whose sum is σ = 51636452. Its totient is φ = 8596800.

The previous prime is 21492379. The next prime is 21492409. The reversal of 21492400 is 429412.

It is not an unprimeable number, because it can be changed into a prime (21492409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26466 + ... + 27265.

Almost surely, 2^21492400 is an apocalyptic number.

21492400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21492400 is an abundant number, since it is smaller than the sum of its proper divisors (30144052).

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

21492400 is a wasteful number, since it uses less digits than its factorization.

21492400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53749 (or 53738 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21492400 is about 4635.9896462352. The cubic root of 21492400 is about 278.0321202298.

The spelling of 21492400 in words is "twenty-one million, four hundred ninety-two thousand, four hundred".