21470748 has 24 divisors (see below), whose sum is σ = 53952528. Its totient is φ = 6606336.

The previous prime is 21470737. The next prime is 21470783. The reversal of 21470748 is 84707412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68661 + ... + 68972.

It is an arithmetic number, because the mean of its divisors is an integer number (2248022).

Almost surely, 2^21470748 is an apocalyptic number.

It is an amenable number.

21470748 is an abundant number, since it is smaller than the sum of its proper divisors (32481780).

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

21470748 is a wasteful number, since it uses less digits than its factorization.

21470748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137653 (or 137651 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 21470748 is about 4633.6538498252. The cubic root of 21470748 is about 277.9387232747.

The spelling of 21470748 in words is "twenty-one million, four hundred seventy thousand, seven hundred forty-eight".