21260336870 has 16 divisors (see below), whose sum is σ = 38319576768. Its totient is φ = 8492808000.

The previous prime is 21260336869. The next prime is 21260336899. The reversal of 21260336870 is 7863306212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1407959 + ... + 1422978.

It is an arithmetic number, because the mean of its divisors is an integer number (2394973548).

Almost surely, 2^21260336870 is an apocalyptic number.

21260336870 is a deficient number, since it is larger than the sum of its proper divisors (17059239898).

21260336870 is a wasteful number, since it uses less digits than its factorization.

21260336870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831695.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 21260336870 in words is "twenty-one billion, two hundred sixty million, three hundred thirty-six thousand, eight hundred seventy".