221261576496 has 80 divisors (see below), whose sum is σ = 587223915264. Its totient is φ = 71738134272.

The previous prime is 221261576483. The next prime is 221261576519. The reversal of 221261576496 is 694675162122.

It is a happy number.

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, 6246291 + ... + 6281613.

Almost surely, 2^221261576496 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 221261576496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293611957632).

221261576496 is an abundant number, since it is smaller than the sum of its proper divisors (365962338768).

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

221261576496 is a wasteful number, since it uses less digits than its factorization.

221261576496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38898 (or 38892 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The spelling of 221261576496 in words is "two hundred twenty-one billion, two hundred sixty-one million, five hundred seventy-six thousand, four hundred ninety-six".