21868715080 has 16 divisors (see below), whose sum is σ = 49204609020. Its totient is φ = 8747486016.

The previous prime is 21868715039. The next prime is 21868715083. The reversal of 21868715080 is 8051786812.

It can be written as a sum of positive squares in 2 ways, for example, as 21854891556 + 13823524 = 147834^2 + 3718^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21868715080.

It is not an unprimeable number, because it can be changed into a prime (21868715083) 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, 273358899 + ... + 273358978.

Almost surely, 2^21868715080 is an apocalyptic number.

21868715080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21868715080 is an abundant number, since it is smaller than the sum of its proper divisors (27335893940).

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

21868715080 is a wasteful number, since it uses less digits than its factorization.

21868715080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546717888 (or 546717884 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 21868715080 in words is "twenty-one billion, eight hundred sixty-eight million, seven hundred fifteen thousand, eighty".