21379300 has 36 divisors (see below), whose sum is σ = 46594240. Its totient is φ = 8514720.

The previous prime is 21379289. The next prime is 21379301. The reversal of 21379300 is 397312.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21379301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43657 + ... + 44143.

Almost surely, 2^21379300 is an apocalyptic number.

21379300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21379300 is an abundant number, since it is smaller than the sum of its proper divisors (25214940).

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

21379300 is a wasteful number, since it uses less digits than its factorization.

21379300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 21379300 is about 4623.7755135819. The cubic root of 21379300 is about 277.5435637583.

The spelling of 21379300 in words is "twenty-one million, three hundred seventy-nine thousand, three hundred".