21486424 has 8 divisors (see below), whose sum is σ = 40287060. Its totient is φ = 10743208.

The previous prime is 21486403. The next prime is 21486433. The reversal of 21486424 is 42468412.

It is a tau number, because it is divible by the number of its divisors (8).

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, 1342894 + ... + 1342909.

Almost surely, 2^21486424 is an apocalyptic number.

It is an amenable number.

21486424 is a deficient number, since it is larger than the sum of its proper divisors (18800636).

21486424 is a wasteful number, since it uses less digits than its factorization.

21486424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685809 (or 2685805 counting only the distinct ones).

The product of its digits is 12288, while the sum is 31.

The square root of 21486424 is about 4635.3450788480. The cubic root of 21486424 is about 278.0063487327.

The spelling of 21486424 in words is "twenty-one million, four hundred eighty-six thousand, four hundred twenty-four".