221980437904 has 15 divisors (see below), whose sum is σ = 430090749867. Its totient is φ = 110989276656.

The previous prime is 221980437859. The next prime is 221980437907. The reversal of 221980437904 is 409734089122.

The square root of 221980437904 is 471148.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221980437907) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1825699 + ... + 1943485.

Almost surely, 2^221980437904 is an apocalyptic number.

221980437904 is the 471148-th square number.

It is an amenable number.

221980437904 is a deficient number, since it is larger than the sum of its proper divisors (208110311963).

221980437904 is an frugal number, since it uses more digits than its factorization.

221980437904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235582 (or 117789 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

Multiplying 221980437904 by its sum of digits (49), we get a square (10877041457296 = 3298036²).

The spelling of 221980437904 in words is "two hundred twenty-one billion, nine hundred eighty million, four hundred thirty-seven thousand, nine hundred four".