612121222 has 4 divisors (see below), whose sum is σ = 918181836. Its totient is φ = 306060610.

The previous prime is 612121201. The next prime is 612121231. The reversal of 612121222 is 222121216.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 612121222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153030304 + ... + 153030307.

It is an arithmetic number, because the mean of its divisors is an integer number (229545459).

Almost surely, 2^612121222 is an apocalyptic number.

612121222 is a deficient number, since it is larger than the sum of its proper divisors (306060614).

612121222 is a wasteful number, since it uses less digits than its factorization.

612121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306060613.

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

The square root of 612121222 is about 24741.0836868558. The cubic root of 612121222 is about 849.0745276679.

Adding to 612121222 its reverse (222121216), we get a palindrome (834242438).

The spelling of 612121222 in words is "six hundred twelve million, one hundred twenty-one thousand, two hundred twenty-two".