21610748 has 6 divisors (see below), whose sum is σ = 37818816. Its totient is φ = 10805372.

The previous prime is 21610691. The next prime is 21610753. The reversal of 21610748 is 84701612.

It is a self number, because there is not a number n which added to its sum of digits gives 21610748.

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, 2701340 + ... + 2701347.

It is an arithmetic number, because the mean of its divisors is an integer number (6303136).

Almost surely, 2^21610748 is an apocalyptic number.

It is an amenable number.

21610748 is a deficient number, since it is larger than the sum of its proper divisors (16208068).

21610748 is a wasteful number, since it uses less digits than its factorization.

21610748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5402691 (or 5402689 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 21610748 is about 4648.7361723376. The cubic root of 21610748 is about 278.5415147616.

The spelling of 21610748 in words is "twenty-one million, six hundred ten thousand, seven hundred forty-eight".