122721515808 has 96 divisors (see below), whose sum is σ = 328177745280. Its totient is φ = 40144066560.

The previous prime is 122721515797. The next prime is 122721515827. The reversal of 122721515808 is 808515127221.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 122721515808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2546916 + ... + 2594652.

It is an arithmetic number, because the mean of its divisors is an integer number (3418518180).

Almost surely, 2^122721515808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122721515808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164088872640).

122721515808 is an abundant number, since it is smaller than the sum of its proper divisors (205456229472).

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

122721515808 is a wasteful number, since it uses less digits than its factorization.

122721515808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48250 (or 48242 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 42.

The spelling of 122721515808 in words is "one hundred twenty-two billion, seven hundred twenty-one million, five hundred fifteen thousand, eight hundred eight".