21260870 has 8 divisors (see below), whose sum is σ = 38269584. Its totient is φ = 8504344.

The previous prime is 21260851. The next prime is 21260881. The reversal of 21260870 is 7806212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063034 + ... + 1063053.

It is an arithmetic number, because the mean of its divisors is an integer number (4783698).

Almost surely, 2^21260870 is an apocalyptic number.

21260870 is a deficient number, since it is larger than the sum of its proper divisors (17008714).

21260870 is a wasteful number, since it uses less digits than its factorization.

21260870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126094.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21260870 is about 4610.9510949478. The cubic root of 21260870 is about 277.0301330893.

The spelling of 21260870 in words is "twenty-one million, two hundred sixty thousand, eight hundred seventy".