161212222 has 8 divisors (see below), whose sum is σ = 242884296. Its totient is φ = 80250792.

The previous prime is 161212211. The next prime is 161212223. The reversal of 161212222 is 222212161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 161212222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161212223) 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, 177093 + ... + 178000.

It is an arithmetic number, because the mean of its divisors is an integer number (30360537).

Almost surely, 2^161212222 is an apocalyptic number.

161212222 is a deficient number, since it is larger than the sum of its proper divisors (81672074).

161212222 is a wasteful number, since it uses less digits than its factorization.

161212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355322.

The product of its digits is 192, while the sum is 19.

The square root of 161212222 is about 12696.9375047686. The cubic root of 161212222 is about 544.2511073099.

Adding to 161212222 its reverse (222212161), we get a palindrome (383424383).

The spelling of 161212222 in words is "one hundred sixty-one million, two hundred twelve thousand, two hundred twenty-two".