21926900 has 36 divisors (see below), whose sum is σ = 49228620. Its totient is φ = 8467200.

The previous prime is 21926897. The next prime is 21926917. The reversal of 21926900 is 962912.

It can be written as a sum of positive squares in 6 ways, for example, as 1532644 + 20394256 = 1238^2 + 4516^2 .

It is a super-2 number, since 2×21926900² = 961577887220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

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, 881 + ... + 6680.

Almost surely, 2^21926900 is an apocalyptic number.

21926900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21926900 is an abundant number, since it is smaller than the sum of its proper divisors (27301720).

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

21926900 is a wasteful number, since it uses less digits than its factorization.

21926900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7604 (or 7597 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 21926900 is about 4682.6167897875. The cubic root of 21926900 is about 279.8932416133.

The spelling of 21926900 in words is "twenty-one million, nine hundred twenty-six thousand, nine hundred".