221392834576 has 45 divisors (see below), whose sum is σ = 434739044061. Its totient is φ = 109221795072.

The previous prime is 221392834561. The next prime is 221392834601. The reversal of 221392834576 is 675438293122.

It is a happy number.

The square root of 221392834576 is 470524.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 47403740176 + 173989094400 = 217724^2 + 417120^2 .

It is a super-2 number, since 2×221392834576² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 148684840 + ... + 148686328.

Almost surely, 2^221392834576 is an apocalyptic number.

221392834576 is the 470524-th square number.

It is an amenable number.

221392834576 is a deficient number, since it is larger than the sum of its proper divisors (213346209485).

221392834576 is an frugal number, since it uses more digits than its factorization.

221392834576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144 (or 1570 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The spelling of 221392834576 in words is "two hundred twenty-one billion, three hundred ninety-two million, eight hundred thirty-four thousand, five hundred seventy-six".