21939048 has 24 divisors (see below), whose sum is σ = 59418450. Its totient is φ = 7312992.

The previous prime is 21939017. The next prime is 21939067. The reversal of 21939048 is 84093912.

It can be written as a sum of positive squares in only one way, i.e., 12830724 + 9108324 = 3582^2 + 3018^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 152283 + ... + 152426.

Almost surely, 2^21939048 is an apocalyptic number.

It is an amenable number.

21939048 is an abundant number, since it is smaller than the sum of its proper divisors (37479402).

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

21939048 is a wasteful number, since it uses less digits than its factorization.

21939048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304721 (or 304714 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 21939048 is about 4683.9137481384. The cubic root of 21939048 is about 279.9449211389.

It can be divided in two parts, 2193904 and 8, that added together give a palindrome (2193912).

The spelling of 21939048 in words is "twenty-one million, nine hundred thirty-nine thousand, forty-eight".