21753948 has 24 divisors (see below), whose sum is σ = 53745552. Its totient is φ = 6824704.

The previous prime is 21753937. The next prime is 21753961. The reversal of 21753948 is 84935712.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 53115 + ... + 53522.

It is an arithmetic number, because the mean of its divisors is an integer number (2239398).

Almost surely, 2^21753948 is an apocalyptic number.

It is an amenable number.

21753948 is an abundant number, since it is smaller than the sum of its proper divisors (31991604).

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

21753948 is a wasteful number, since it uses less digits than its factorization.

21753948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106661 (or 106659 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 21753948 is about 4664.1127773672. The cubic root of 21753948 is about 279.1553970451.

The spelling of 21753948 in words is "twenty-one million, seven hundred fifty-three thousand, nine hundred forty-eight".