221402212 has 12 divisors (see below), whose sum is σ = 407846320. Its totient is φ = 104874696.

The previous prime is 221402179. The next prime is 221402219. The reversal of 221402212 is 212204122.

It is not an unprimeable number, because it can be changed into a prime (221402219) 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, 1456518 + ... + 1456669.

Almost surely, 2^221402212 is an apocalyptic number.

It is an amenable number.

221402212 is a deficient number, since it is larger than the sum of its proper divisors (186444108).

221402212 is a wasteful number, since it uses less digits than its factorization.

221402212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913210 (or 2913208 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221402212 is about 14879.5904513532. The cubic root of 221402212 is about 604.9609172668.

Adding to 221402212 its reverse (212204122), we get a palindrome (433606334).

The spelling of 221402212 in words is "two hundred twenty-one million, four hundred two thousand, two hundred twelve".