21477816716 has 12 divisors (see below), whose sum is σ = 38202346560. Its totient is φ = 10562860560.

The previous prime is 21477816697. The next prime is 21477816719. The reversal of 21477816716 is 61761877412.

It is a super-2 number, since 2×21477816716² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21477816719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44011676 + ... + 44012163.

It is an arithmetic number, because the mean of its divisors is an integer number (3183528880).

Almost surely, 2^21477816716 is an apocalyptic number.

It is an amenable number.

21477816716 is a deficient number, since it is larger than the sum of its proper divisors (16724529844).

21477816716 is a wasteful number, since it uses less digits than its factorization.

21477816716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88023904 (or 88023902 counting only the distinct ones).

The product of its digits is 790272, while the sum is 50.

The spelling of 21477816716 in words is "twenty-one billion, four hundred seventy-seven million, eight hundred sixteen thousand, seven hundred sixteen".