221123212 has 12 divisors (see below), whose sum is σ = 391864480. Its totient is φ = 109161936.

The previous prime is 221123191. The next prime is 221123213. The reversal of 221123212 is 212321122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221123213) 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, 349563 + ... + 350194.

Almost surely, 2^221123212 is an apocalyptic number.

It is an amenable number.

221123212 is a deficient number, since it is larger than the sum of its proper divisors (170741268).

221123212 is a wasteful number, since it uses less digits than its factorization.

221123212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699840 (or 699838 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 221123212 is about 14870.2122378936. The cubic root of 221123212 is about 604.7066966159.

Adding to 221123212 its reverse (212321122), we get a palindrome (433444334).

The spelling of 221123212 in words is "two hundred twenty-one million, one hundred twenty-three thousand, two hundred twelve".