221577215640 has 64 divisors (see below), whose sum is σ = 725161800960. Its totient is φ = 53715688320.

The previous prime is 221577215633. The next prime is 221577215663. The reversal of 221577215640 is 46512775122.

It is a junction number, because it is equal to n+sod(n) for n = 221577215592 and 221577215601.

It is a congruent 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, 83929444 + ... + 83932083.

It is an arithmetic number, because the mean of its divisors is an integer number (11330653140).

Almost surely, 2^221577215640 is an apocalyptic number.

221577215640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221577215640 is an abundant number, since it is smaller than the sum of its proper divisors (503584585320).

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

221577215640 is a wasteful number, since it uses less digits than its factorization.

221577215640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167861552 (or 167861548 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 42.

The spelling of 221577215640 in words is "two hundred twenty-one billion, five hundred seventy-seven million, two hundred fifteen thousand, six hundred forty".