21064748 has 24 divisors (see below), whose sum is σ = 38258304. Its totient is φ = 10137600.

The previous prime is 21064723. The next prime is 21064753. The reversal of 21064748 is 84746012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31538 + ... + 32198.

It is an arithmetic number, because the mean of its divisors is an integer number (1594096).

Almost surely, 2^21064748 is an apocalyptic number.

It is an amenable number.

21064748 is a deficient number, since it is larger than the sum of its proper divisors (17193556).

21064748 is a wasteful number, since it uses less digits than its factorization.

21064748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 951 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 21064748 is about 4589.6348438629. The cubic root of 21064748 is about 276.1756740590.

It can be divided in two parts, 21064 and 748, that added together give a palindrome (21812).

The spelling of 21064748 in words is "twenty-one million, sixty-four thousand, seven hundred forty-eight".