221347772 has 12 divisors (see below), whose sum is σ = 393709176. Its totient is φ = 108859440.

The previous prime is 221347771. The next prime is 221347783. The reversal of 221347772 is 277743122.

It is a hoax number, since the sum of its digits (35) 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 (221347771) 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, 453338 + ... + 453825.

It is an arithmetic number, because the mean of its divisors is an integer number (32809098).

Almost surely, 2^221347772 is an apocalyptic number.

It is an amenable number.

221347772 is a deficient number, since it is larger than the sum of its proper divisors (172361404).

221347772 is a wasteful number, since it uses less digits than its factorization.

221347772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907228 (or 907226 counting only the distinct ones).

The product of its digits is 32928, while the sum is 35.

The square root of 221347772 is about 14877.7609874604. The cubic root of 221347772 is about 604.9113291262.

The spelling of 221347772 in words is "two hundred twenty-one million, three hundred forty-seven thousand, seven hundred seventy-two".