21952308 has 24 divisors (see below), whose sum is σ = 58539712. Its totient is φ = 6272064.

The previous prime is 21952297. The next prime is 21952313. The reversal of 21952308 is 80325912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130585 + ... + 130752.

Almost surely, 2^21952308 is an apocalyptic number.

21952308 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21952308 is an abundant number, since it is smaller than the sum of its proper divisors (36587404).

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

21952308 is a wasteful number, since it uses less digits than its factorization.

21952308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261351 (or 261349 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 21952308 is about 4685.3290172623. The cubic root of 21952308 is about 280.0013095177.

The spelling of 21952308 in words is "twenty-one million, nine hundred fifty-two thousand, three hundred eight".