21753474 has 8 divisors (see below), whose sum is σ = 43506960. Its totient is φ = 7251156.

The previous prime is 21753419. The next prime is 21753533. The reversal of 21753474 is 47435712.

It is a sphenic number, since it is the product of 3 distinct primes.

21753474 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 1812784 + ... + 1812795.

It is an arithmetic number, because the mean of its divisors is an integer number (5438370).

Almost surely, 2^21753474 is an apocalyptic number.

21753474 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21753474 is a wasteful number, since it uses less digits than its factorization.

21753474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625584.

The product of its digits is 23520, while the sum is 33.

The square root of 21753474 is about 4664.0619635678. The cubic root of 21753474 is about 279.1533695109.

The spelling of 21753474 in words is "twenty-one million, seven hundred fifty-three thousand, four hundred seventy-four".