21838300 has 36 divisors (see below), whose sum is σ = 51699816. Its totient is φ = 7940800.

The previous prime is 21838283. The next prime is 21838301. The reversal of 21838300 is 383812.

It is a super-2 number, since 2×21838300² = 953822693780000, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21838301) 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, 8827 + ... + 11026.

It is an arithmetic number, because the mean of its divisors is an integer number (1436106).

Almost surely, 2^21838300 is an apocalyptic number.

21838300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21838300 is an abundant number, since it is smaller than the sum of its proper divisors (29861516).

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

21838300 is a wasteful number, since it uses less digits than its factorization.

21838300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19878 (or 19871 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21838300 is about 4673.1466914703. The cubic root of 21838300 is about 279.5157446037.

The spelling of 21838300 in words is "twenty-one million, eight hundred thirty-eight thousand, three hundred".