1213222131 has 40 divisors (see below), whose sum is σ = 2006710464. Its totient is φ = 724276080.

The previous prime is 1213222123. The next prime is 1213222141. The reversal of 1213222131 is 1312223121.

It is not a de Polignac number, because 1213222131 - 2³ = 1213222123 is a prime.

It is a super-2 number, since 2×1213222131² = 2943815878296362322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213222111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 49536 + ... + 69858.

Almost surely, 2^1213222131 is an apocalyptic number.

1213222131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1213222131 is a deficient number, since it is larger than the sum of its proper divisors (793488333).

1213222131 is a wasteful number, since it uses less digits than its factorization.

1213222131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20413 (or 20404 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1213222131 is about 34831.3383463800. The cubic root of 1213222131 is about 1066.5472689382.

Adding to 1213222131 its reverse (1312223121), we get a palindrome (2525445252).

The spelling of 1213222131 in words is "one billion, two hundred thirteen million, two hundred twenty-two thousand, one hundred thirty-one".