21930376 has 16 divisors (see below), whose sum is σ = 44282700. Its totient is φ = 10121664.

The previous prime is 21930371. The next prime is 21930379. The reversal of 21930376 is 67303912.

It can be written as a sum of positive squares in 2 ways, for example, as 21846276 + 84100 = 4674^2 + 290^2 .

It is not an unprimeable number, because it can be changed into a prime (21930371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105331 + ... + 105538.

Almost surely, 2^21930376 is an apocalyptic number.

21930376 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21930376 is an abundant number, since it is smaller than the sum of its proper divisors (22352324).

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

21930376 is a wasteful number, since it uses less digits than its factorization.

21930376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210888 (or 210884 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 21930376 is about 4682.9879350688. The cubic root of 21930376 is about 279.9080310196.

The spelling of 21930376 in words is "twenty-one million, nine hundred thirty thousand, three hundred seventy-six".