21927852 has 18 divisors (see below), whose sum is σ = 55428828. Its totient is φ = 7309272.

The previous prime is 21927847. The next prime is 21927859. The reversal of 21927852 is 25872912.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 609107 = 21927852 / (2 + 1 + 9 + 2 + 7 + 8 + 5 + 2).

It is not an unprimeable number, because it can be changed into a prime (21927859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 304518 + ... + 304589.

Almost surely, 2^21927852 is an apocalyptic number.

It is an amenable number.

21927852 is an abundant number, since it is smaller than the sum of its proper divisors (33500976).

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

21927852 is a wasteful number, since it uses less digits than its factorization.

21927852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609117 (or 609112 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 21927852 is about 4682.7184412476. The cubic root of 21927852 is about 279.8972922620.

The spelling of 21927852 in words is "twenty-one million, nine hundred twenty-seven thousand, eight hundred fifty-two".