221672212 has 6 divisors (see below), whose sum is σ = 387926378. Its totient is φ = 110836104.

The previous prime is 221672177. The next prime is 221672219. The reversal of 221672212 is 212276122.

221672212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 199261456 + 22410756 = 14116^2 + 4734^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221672219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27709023 + ... + 27709030.

Almost surely, 2^221672212 is an apocalyptic number.

It is an amenable number.

221672212 is a deficient number, since it is larger than the sum of its proper divisors (166254166).

221672212 is a wasteful number, since it uses less digits than its factorization.

221672212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55418057 (or 55418055 counting only the distinct ones).

The product of its digits is 1344, while the sum is 25.

The square root of 221672212 is about 14888.6605173199. The cubic root of 221672212 is about 605.2067339845.

The spelling of 221672212 in words is "two hundred twenty-one million, six hundred seventy-two thousand, two hundred twelve".