1213422231 has 24 divisors (see below), whose sum is σ = 1885073904. Its totient is φ = 692267520.

The previous prime is 1213422211. The next prime is 1213422233. The reversal of 1213422231 is 1322243121.

It is not a de Polignac number, because 1213422231 - 2¹⁰ = 1213421207 is a prime.

It is a super-2 number, since 2×1213422231² = 2944787021370034722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1213422198 and 1213422207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213422233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89671 + ... + 102311.

It is an arithmetic number, because the mean of its divisors is an integer number (78544746).

Almost surely, 2^1213422231 is an apocalyptic number.

1213422231 is a deficient number, since it is larger than the sum of its proper divisors (671651673).

1213422231 is a wasteful number, since it uses less digits than its factorization.

1213422231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13311 (or 13304 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 1213422231 is about 34834.2106412647. The cubic root of 1213422231 is about 1066.6059018879.

Adding to 1213422231 its reverse (1322243121), we get a palindrome (2535665352).

The spelling of 1213422231 in words is "one billion, two hundred thirteen million, four hundred twenty-two thousand, two hundred thirty-one".