221816079212 has 48 divisors (see below), whose sum is σ = 478027959360. Its totient is φ = 87701778432.

The previous prime is 221816079197. The next prime is 221816079241. The reversal of 221816079212 is 212970618122.

It is a self number, because there is not a number n which added to its sum of digits gives 221816079212.

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, 475364 + ... + 818292.

It is an arithmetic number, because the mean of its divisors is an integer number (9958915820).

Almost surely, 2^221816079212 is an apocalyptic number.

It is an amenable number.

221816079212 is an abundant number, since it is smaller than the sum of its proper divisors (256211880148).

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

221816079212 is a wasteful number, since it uses less digits than its factorization.

221816079212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344730 (or 344728 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 221816079212 in words is "two hundred twenty-one billion, eight hundred sixteen million, seventy-nine thousand, two hundred twelve".