221667212 has 12 divisors (see below), whose sum is σ = 417757536. Its totient is φ = 102307920.

The previous prime is 221667209. The next prime is 221667217. The reversal of 221667212 is 212766122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221667217) 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, 2131364 + ... + 2131467.

It is an arithmetic number, because the mean of its divisors is an integer number (34813128).

Almost surely, 2^221667212 is an apocalyptic number.

It is an amenable number.

221667212 is a deficient number, since it is larger than the sum of its proper divisors (196090324).

221667212 is a wasteful number, since it uses less digits than its factorization.

221667212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4262848 (or 4262846 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 221667212 is about 14888.4926033497. The cubic root of 221667212 is about 605.2021836375.

The spelling of 221667212 in words is "two hundred twenty-one million, six hundred sixty-seven thousand, two hundred twelve".