221872396 has 6 divisors (see below), whose sum is σ = 388276700. Its totient is φ = 110936196.

The previous prime is 221872381. The next prime is 221872397. The reversal of 221872396 is 693278122.

It is not an unprimeable number, because it can be changed into a prime (221872397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27734046 + ... + 27734053.

Almost surely, 2^221872396 is an apocalyptic number.

It is an amenable number.

221872396 is a deficient number, since it is larger than the sum of its proper divisors (166404304).

221872396 is a wasteful number, since it uses less digits than its factorization.

221872396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55468103 (or 55468101 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 221872396 is about 14895.3817003795. The cubic root of 221872396 is about 605.3888591330.

The spelling of 221872396 in words is "two hundred twenty-one million, eight hundred seventy-two thousand, three hundred ninety-six".