21715449836 has 12 divisors (see below), whose sum is σ = 38003978712. Its totient is φ = 10857170208.

The previous prime is 21715449827. The next prime is 21715449859. The reversal of 21715449836 is 63894451712.

It is a happy 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, 43310 + ... + 212853.

It is an arithmetic number, because the mean of its divisors is an integer number (3166998226).

Almost surely, 2^21715449836 is an apocalyptic number.

It is an amenable number.

21715449836 is a deficient number, since it is larger than the sum of its proper divisors (16288528876).

21715449836 is a wasteful number, since it uses less digits than its factorization.

21715449836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277360 (or 277358 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 50.

The spelling of 21715449836 in words is "twenty-one billion, seven hundred fifteen million, four hundred forty-nine thousand, eight hundred thirty-six".