21116768316 has 48 divisors (see below), whose sum is σ = 57833319936. Its totient is φ = 5870297664.

The previous prime is 21116768291. The next prime is 21116768317. The reversal of 21116768316 is 61386761112.

It is a super-2 number, since 2×21116768316² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116768317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3394056 + ... + 3400271.

It is an arithmetic number, because the mean of its divisors is an integer number (1204860832).

Almost surely, 2^21116768316 is an apocalyptic number.

It is an amenable number.

21116768316 is an abundant number, since it is smaller than the sum of its proper divisors (36716551620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21116768316 is a wasteful number, since it uses less digits than its factorization.

21116768316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6794378 (or 6794376 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The spelling of 21116768316 in words is "twenty-one billion, one hundred sixteen million, seven hundred sixty-eight thousand, three hundred sixteen".