21847715615716 has 27 divisors (see below), whose sum is σ = 38374662823707. Its totient is φ = 10883674105920.

The previous prime is 21847715615647. The next prime is 21847715615723. The reversal of 21847715615716 is 61751651774812.

The square root of 21847715615716 is 4674154.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 11969870062500 + 9877845553216 = 3459750^2 + 3142904^2 .

It is a Duffinian 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 8 ways as a sum of consecutive naturals, for example, 2626870390 + ... + 2626878706.

Almost surely, 2^{21847715615716} is an apocalyptic number.

21847715615716 is the 4674154-th square number.

It is an amenable number.

21847715615716 is a deficient number, since it is larger than the sum of its proper divisors (16526947207991).

21847715615716 is an frugal number, since it uses more digits than its factorization.

21847715615716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17200 (or 8600 counting only the distinct ones).

The product of its digits is 19756800, while the sum is 61.

The spelling of 21847715615716 in words is "twenty-one trillion, eight hundred forty-seven billion, seven hundred fifteen million, six hundred fifteen thousand, seven hundred sixteen".