21347752 has 8 divisors (see below), whose sum is σ = 40027050. Its totient is φ = 10673872.

The previous prime is 21347723. The next prime is 21347771. The reversal of 21347752 is 25774312.

It can be written as a sum of positive squares in only one way, i.e., 19589476 + 1758276 = 4426^2 + 1326^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1334227 + ... + 1334242.

Almost surely, 2^21347752 is an apocalyptic number.

It is an amenable number.

21347752 is a deficient number, since it is larger than the sum of its proper divisors (18679298).

21347752 is a wasteful number, since it uses less digits than its factorization.

21347752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668475 (or 2668471 counting only the distinct ones).

The product of its digits is 11760, while the sum is 31.

The square root of 21347752 is about 4620.3627563212. The cubic root of 21347752 is about 277.4069790754.

The spelling of 21347752 in words is "twenty-one million, three hundred forty-seven thousand, seven hundred fifty-two".