21116777264 has 40 divisors (see below), whose sum is σ = 44644696128. Its totient is φ = 9596060480.

The previous prime is 21116777221. The next prime is 21116777287. The reversal of 21116777264 is 46277761112.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 787079 + ... + 813465.

Almost surely, 2^21116777264 is an apocalyptic number.

It is an amenable number.

21116777264 is an abundant number, since it is smaller than the sum of its proper divisors (23527918864).

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

21116777264 is a wasteful number, since it uses less digits than its factorization.

21116777264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30953 (or 30947 counting only the distinct ones).

The product of its digits is 197568, while the sum is 44.

The spelling of 21116777264 in words is "twenty-one billion, one hundred sixteen million, seven hundred seventy-seven thousand, two hundred sixty-four".