21935238 has 32 divisors (see below), whose sum is σ = 49303296. Its totient is φ = 6455328.

The previous prime is 21935233. The next prime is 21935239. The reversal of 21935238 is 83253912.

It is a super-2 number, since 2×21935238² = 962309332233288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21935199 and 21935208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21935233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4320 + ... + 7907.

It is an arithmetic number, because the mean of its divisors is an integer number (1540728).

Almost surely, 2^21935238 is an apocalyptic number.

21935238 is an abundant number, since it is smaller than the sum of its proper divisors (27368058).

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

21935238 is a wasteful number, since it uses less digits than its factorization.

21935238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12268.

The product of its digits is 12960, while the sum is 33.

The square root of 21935238 is about 4683.5070193179. The cubic root of 21935238 is about 279.9287148463.

The spelling of 21935238 in words is "twenty-one million, nine hundred thirty-five thousand, two hundred thirty-eight".