21261045886 has 8 divisors (see below), whose sum is σ = 33767543520. Its totient is φ = 10005198048.

The previous prime is 21261045853. The next prime is 21261045893. The reversal of 21261045886 is 68854016212.

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, 312662406 + ... + 312662473.

It is an arithmetic number, because the mean of its divisors is an integer number (4220942940).

Almost surely, 2^21261045886 is an apocalyptic number.

21261045886 is a deficient number, since it is larger than the sum of its proper divisors (12506497634).

21261045886 is a wasteful number, since it uses less digits than its factorization.

21261045886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625324898.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 21261045886 in words is "twenty-one billion, two hundred sixty-one million, forty-five thousand, eight hundred eighty-six".