221276444 has 12 divisors (see below), whose sum is σ = 387544584. Its totient is φ = 110549424.

The previous prime is 221276443. The next prime is 221276459. The reversal of 221276444 is 444672122.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 221276444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221276443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16427 + ... + 26690.

It is an arithmetic number, because the mean of its divisors is an integer number (32295382).

Almost surely, 2^221276444 is an apocalyptic number.

It is an amenable number.

221276444 is a deficient number, since it is larger than the sum of its proper divisors (166268140).

221276444 is a wasteful number, since it uses less digits than its factorization.

221276444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44404 (or 44402 counting only the distinct ones).

The product of its digits is 21504, while the sum is 32.

The square root of 221276444 is about 14875.3636594202. The cubic root of 221276444 is about 604.8463457889.

The spelling of 221276444 in words is "two hundred twenty-one million, two hundred seventy-six thousand, four hundred forty-four".