21750464 has 28 divisors (see below), whose sum is σ = 44653200. Its totient is φ = 10499328.

The previous prime is 21750461. The next prime is 21750467. The reversal of 21750464 is 46405712.

It is an interprime number because it is at equal distance from previous prime (21750461) and next prime (21750467).

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (21750461) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4004 + ... + 7715.

Almost surely, 2^21750464 is an apocalyptic number.

It is an amenable number.

21750464 is an abundant number, since it is smaller than the sum of its proper divisors (22902736).

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

21750464 is a wasteful number, since it uses less digits than its factorization.

21750464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11760 (or 11750 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 21750464 is about 4663.7392723007. The cubic root of 21750464 is about 279.1404935538.

The spelling of 21750464 in words is "twenty-one million, seven hundred fifty thousand, four hundred sixty-four".