21804216716 has 6 divisors (see below), whose sum is σ = 38157379260. Its totient is φ = 10902108356.

The previous prime is 21804216671. The next prime is 21804216751. The reversal of 21804216716 is 61761240812.

It is a self number, because there is not a number n which added to its sum of digits gives 21804216716.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2725527086 + ... + 2725527093.

It is an arithmetic number, because the mean of its divisors is an integer number (6359563210).

Almost surely, 2^21804216716 is an apocalyptic number.

It is an amenable number.

21804216716 is a deficient number, since it is larger than the sum of its proper divisors (16353162544).

21804216716 is a wasteful number, since it uses less digits than its factorization.

21804216716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451054183 (or 5451054181 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 21804216716 in words is "twenty-one billion, eight hundred four million, two hundred sixteen thousand, seven hundred sixteen".