21766695072 has 48 divisors (see below), whose sum is σ = 58681842912. Its totient is φ = 7059467520.

The previous prime is 21766695061. The next prime is 21766695077. The reversal of 21766695072 is 27059666712.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (21766695077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3060454 + ... + 3067557.

It is an arithmetic number, because the mean of its divisors is an integer number (1222538394).

Almost surely, 2^21766695072 is an apocalyptic number.

It is an amenable number.

21766695072 is an abundant number, since it is smaller than the sum of its proper divisors (36915147840).

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

21766695072 is a wasteful number, since it uses less digits than its factorization.

21766695072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6128061 (or 6128053 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 51.

The spelling of 21766695072 in words is "twenty-one billion, seven hundred sixty-six million, six hundred ninety-five thousand, seventy-two".