1231205222 has 12 divisors (see below), whose sum is σ = 1999798380. Its totient is φ = 568248408.

The previous prime is 1231205221. The next prime is 1231205231. The reversal of 1231205222 is 2225021321.

It is a junction number, because it is equal to n+sod(n) for n = 1231205194 and 1231205203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231205221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1820972 + ... + 1821647.

It is an arithmetic number, because the mean of its divisors is an integer number (166649865).

Almost surely, 2^1231205222 is an apocalyptic number.

1231205222 is a deficient number, since it is larger than the sum of its proper divisors (768593158).

1231205222 is a wasteful number, since it uses less digits than its factorization.

1231205222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642647 (or 3642634 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1231205222 is about 35088.5340531633. The cubic root of 1231205222 is about 1071.7911079154.

Adding to 1231205222 its reverse (2225021321), we get a palindrome (3456226543).

The spelling of 1231205222 in words is "one billion, two hundred thirty-one million, two hundred five thousand, two hundred twenty-two".