21633450 has 24 divisors (see below), whose sum is σ = 53651328. Its totient is φ = 5768880.

The previous prime is 21633427. The next prime is 21633499. The reversal of 21633450 is 5433612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21633450.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71962 + ... + 72261.

It is an arithmetic number, because the mean of its divisors is an integer number (2235472).

Almost surely, 2^21633450 is an apocalyptic number.

21633450 is an abundant number, since it is smaller than the sum of its proper divisors (32017878).

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

21633450 is a wasteful number, since it uses less digits than its factorization.

21633450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144238 (or 144233 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21633450 is about 4651.1772703263. The cubic root of 21633450 is about 278.6390161918.

The spelling of 21633450 in words is "twenty-one million, six hundred thirty-three thousand, four hundred fifty".