21888952 has 16 divisors (see below), whose sum is σ = 41221440. Its totient is φ = 10896576.

The previous prime is 21888949. The next prime is 21888953. The reversal of 21888952 is 25988812.

It is a junction number, because it is equal to n+sod(n) for n = 21888899 and 21888908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21888953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4008 + ... + 7735.

It is an arithmetic number, because the mean of its divisors is an integer number (2576340).

Almost surely, 2^21888952 is an apocalyptic number.

It is an amenable number.

21888952 is a deficient number, since it is larger than the sum of its proper divisors (19332488).

21888952 is a wasteful number, since it uses less digits than its factorization.

21888952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11982 (or 11978 counting only the distinct ones).

The product of its digits is 92160, while the sum is 43.

The square root of 21888952 is about 4678.5630272553. The cubic root of 21888952 is about 279.7316817337.

The spelling of 21888952 in words is "twenty-one million, eight hundred eighty-eight thousand, nine hundred fifty-two".