221634412 has 12 divisors (see below), whose sum is σ = 388233216. Its totient is φ = 110710640.

The previous prime is 221634383. The next prime is 221634419. The reversal of 221634412 is 214436122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221634419) 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, 21868 + ... + 30355.

It is an arithmetic number, because the mean of its divisors is an integer number (32352768).

Almost surely, 2^221634412 is an apocalyptic number.

It is an amenable number.

221634412 is a deficient number, since it is larger than the sum of its proper divisors (166598804).

221634412 is a wasteful number, since it uses less digits than its factorization.

221634412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53288 (or 53286 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 221634412 is about 14887.3910407432. The cubic root of 221634412 is about 605.1723316646.

The spelling of 221634412 in words is "two hundred twenty-one million, six hundred thirty-four thousand, four hundred twelve".