21260838 has 16 divisors (see below), whose sum is σ = 42661296. Its totient is φ = 7063680.

The previous prime is 21260819. The next prime is 21260843. The reversal of 21260838 is 83806212.

It is a congruent number.

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, 3783 + ... + 7538.

It is an arithmetic number, because the mean of its divisors is an integer number (2666331).

Almost surely, 2^21260838 is an apocalyptic number.

21260838 is an abundant number, since it is smaller than the sum of its proper divisors (21400458).

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

21260838 is a wasteful number, since it uses less digits than its factorization.

21260838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11639.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21260838 is about 4610.9476249465. The cubic root of 21260838 is about 277.0299941020.

The spelling of 21260838 in words is "twenty-one million, two hundred sixty thousand, eight hundred thirty-eight".