21904048 has 20 divisors (see below), whose sum is σ = 43903440. Its totient is φ = 10574144.

The previous prime is 21904031. The next prime is 21904061. The reversal of 21904048 is 84040912.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23140 + ... + 24067.

It is an arithmetic number, because the mean of its divisors is an integer number (2195172).

Almost surely, 2^21904048 is an apocalyptic number.

It is an amenable number.

21904048 is an abundant number, since it is smaller than the sum of its proper divisors (21999392).

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

21904048 is a wasteful number, since it uses less digits than its factorization.

21904048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47244 (or 47238 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21904048 is about 4680.1760650642. The cubic root of 21904048 is about 279.7959738184.

The spelling of 21904048 in words is "twenty-one million, nine hundred four thousand, forty-eight".