21948604 has 12 divisors (see below), whose sum is σ = 38462200. Its totient is φ = 10959408.

The previous prime is 21948569. The next prime is 21948607. The reversal of 21948604 is 40684912.

It is a self number, because there is not a number n which added to its sum of digits gives 21948604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7 + ... + 6625.

Almost surely, 2^21948604 is an apocalyptic number.

It is an amenable number.

21948604 is a deficient number, since it is larger than the sum of its proper divisors (16513596).

21948604 is a wasteful number, since it uses less digits than its factorization.

21948604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7452 (or 7450 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 21948604 is about 4684.9337241844. The cubic root of 21948604 is about 279.9855604799.

The spelling of 21948604 in words is "twenty-one million, nine hundred forty-eight thousand, six hundred four".