21952490 has 48 divisors (see below), whose sum is σ = 46687104. Its totient is φ = 7408800.

The previous prime is 21952477. The next prime is 21952501. The reversal of 21952490 is 9425912.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34475 + ... + 35105.

It is an arithmetic number, because the mean of its divisors is an integer number (972648).

Almost surely, 2^21952490 is an apocalyptic number.

21952490 is an abundant number, since it is smaller than the sum of its proper divisors (24734614).

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

21952490 is a wasteful number, since it uses less digits than its factorization.

21952490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 21952490 is about 4685.3484395507. The cubic root of 21952490 is about 280.0020833178.

The spelling of 21952490 in words is "twenty-one million, nine hundred fifty-two thousand, four hundred ninety".