21927484 has 12 divisors (see below), whose sum is σ = 40630464. Its totient is φ = 10318784.

The previous prime is 21927481. The next prime is 21927511. The reversal of 21927484 is 48472912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21927481) by changing a digit.

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, 161164 + ... + 161299.

It is an arithmetic number, because the mean of its divisors is an integer number (3385872).

Almost surely, 2^21927484 is an apocalyptic number.

It is an amenable number.

21927484 is a deficient number, since it is larger than the sum of its proper divisors (18702980).

21927484 is a wasteful number, since it uses less digits than its factorization.

21927484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322484 (or 322482 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 21927484 is about 4682.6791476675. The cubic root of 21927484 is about 279.8957264789.

The spelling of 21927484 in words is "twenty-one million, nine hundred twenty-seven thousand, four hundred eighty-four".