21502772080 has 40 divisors (see below), whose sum is σ = 50033150352. Its totient is φ = 8594363904.

The previous prime is 21502772077. The next prime is 21502772107. The reversal of 21502772080 is 8027720512.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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, 2109 + ... + 207388.

Almost surely, 2^21502772080 is an apocalyptic number.

21502772080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21502772080 is an abundant number, since it is smaller than the sum of its proper divisors (28530378272).

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

21502772080 is a wasteful number, since it uses less digits than its factorization.

21502772080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210793 (or 210787 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The spelling of 21502772080 in words is "twenty-one billion, five hundred two million, seven hundred seventy-two thousand, eighty".