21486748 has 6 divisors (see below), whose sum is σ = 37601816. Its totient is φ = 10743372.

The previous prime is 21486737. The next prime is 21486779. The reversal of 21486748 is 84768412.

It is a self number, because there is not a number n which added to its sum of digits gives 21486748.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2685840 + ... + 2685847.

Almost surely, 2^21486748 is an apocalyptic number.

It is an amenable number.

21486748 is a deficient number, since it is larger than the sum of its proper divisors (16115068).

21486748 is a wasteful number, since it uses less digits than its factorization.

21486748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5371691 (or 5371689 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 21486748 is about 4635.3800275706. The cubic root of 21486748 is about 278.0077461051.

The spelling of 21486748 in words is "twenty-one million, four hundred eighty-six thousand, seven hundred forty-eight".