21952260 has 72 divisors (see below), whose sum is σ = 72648576. Its totient is φ = 5321280.

The previous prime is 21952207. The next prime is 21952291. The reversal of 21952260 is 6225912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3564 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (1009008).

Almost surely, 2^21952260 is an apocalyptic number.

21952260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21952260 is an abundant number, since it is smaller than the sum of its proper divisors (50696316).

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

21952260 is a wasteful number, since it uses less digits than its factorization.

21952260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11113 (or 11108 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21952260 is about 4685.3238948871. The cubic root of 21952260 is about 280.0011054378.

The spelling of 21952260 in words is "twenty-one million, nine hundred fifty-two thousand, two hundred sixty".