1231212222 has 24 divisors (see below), whose sum is σ = 2739725976. Its totient is φ = 399311856.

The previous prime is 1231212221. The next prime is 1231212223. The reversal of 1231212222 is 2222121321.

1231212222 is a `hidden beast` number, since 1 + 231 + 212 + 222 = 666.

It is an interprime number because it is at equal distance from previous prime (1231212221) and next prime (1231212223).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1231212195 and 1231212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231212221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 923668 + ... + 924999.

It is an arithmetic number, because the mean of its divisors is an integer number (114155249).

Almost surely, 2^1231212222 is an apocalyptic number.

1231212222 is an abundant number, since it is smaller than the sum of its proper divisors (1508513754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231212222 is a wasteful number, since it uses less digits than its factorization.

1231212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848712 (or 1848709 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1231212222 is about 35088.6338007053. The cubic root of 1231212222 is about 1071.7931391293.

Adding to 1231212222 its reverse (2222121321), we get a palindrome (3453333543).

Subtracting 1231212222 from its reverse (2222121321), we obtain a palindrome (990909099).

The spelling of 1231212222 in words is "one billion, two hundred thirty-one million, two hundred twelve thousand, two hundred twenty-two".