221981596 has 24 divisors (see below), whose sum is σ = 398868624. Its totient is φ = 108051840.

The previous prime is 221981593. The next prime is 221981603. The reversal of 221981596 is 695189122.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221981593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23776 + ... + 31768.

It is an arithmetic number, because the mean of its divisors is an integer number (16619526).

Almost surely, 2^221981596 is an apocalyptic number.

It is an amenable number.

221981596 is a deficient number, since it is larger than the sum of its proper divisors (176887028).

221981596 is a wasteful number, since it uses less digits than its factorization.

221981596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8181 (or 8179 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

The square root of 221981596 is about 14899.0468151489. The cubic root of 221981596 is about 605.4881618883.

The spelling of 221981596 in words is "two hundred twenty-one million, nine hundred eighty-one thousand, five hundred ninety-six".