21947452 has 12 divisors (see below), whose sum is σ = 38442040. Its totient is φ = 10964016.

The previous prime is 21947447. The next prime is 21947467. The reversal of 21947452 is 25474912.

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 3 ways as a sum of consecutive naturals, for example, 5623 + ... + 8689.

Almost surely, 2^21947452 is an apocalyptic number.

It is an amenable number.

21947452 is a deficient number, since it is larger than the sum of its proper divisors (16494588).

21947452 is a wasteful number, since it uses less digits than its factorization.

21947452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4860 (or 4858 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 21947452 is about 4684.8107752608. The cubic root of 21947452 is about 279.9806619298.

The spelling of 21947452 in words is "twenty-one million, nine hundred forty-seven thousand, four hundred fifty-two".