21079300 has 36 divisors (see below), whose sum is σ = 49903056. Its totient is φ = 7664800.

The previous prime is 21079297. The next prime is 21079309. The reversal of 21079300 is 397012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21079309) 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, 8482 + ... + 10681.

It is an arithmetic number, because the mean of its divisors is an integer number (1386196).

Almost surely, 2^21079300 is an apocalyptic number.

21079300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21079300 is an abundant number, since it is smaller than the sum of its proper divisors (28823756).

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

21079300 is a wasteful number, since it uses less digits than its factorization.

21079300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19188 (or 19181 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 21079300 is about 4591.2198814694. The cubic root of 21079300 is about 276.2392555351.

The spelling of 21079300 in words is "twenty-one million, seventy-nine thousand, three hundred".