221720615016 has 16 divisors (see below), whose sum is σ = 554301537600. Its totient is φ = 73906871664.

The previous prime is 221720615003. The next prime is 221720615029. The reversal of 221720615016 is 610516027122.

It is an interprime number because it is at equal distance from previous prime (221720615003) and next prime (221720615029).

It is a super-2 number, since 2×221720615016² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4619179456 + ... + 4619179503.

It is an arithmetic number, because the mean of its divisors is an integer number (34643846100).

Almost surely, 2^221720615016 is an apocalyptic number.

It is an amenable number.

221720615016 is an abundant number, since it is smaller than the sum of its proper divisors (332580922584).

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

221720615016 is a wasteful number, since it uses less digits than its factorization.

221720615016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9238358968 (or 9238358964 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 221720615016 in words is "two hundred twenty-one billion, seven hundred twenty million, six hundred fifteen thousand, sixteen".