1223213131 has 16 divisors (see below), whose sum is σ = 1440958464. Its totient is φ = 1016576064.

The previous prime is 1223213119. The next prime is 1223213137. The reversal of 1223213131 is 1313123221.

It is not a de Polignac number, because 1223213131 - 2²⁷ = 1088995403 is a prime.

It is a super-2 number, since 2×1223213131² = 2992500727701646322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223213099 and 1223213108.

It is not an unprimeable number, because it can be changed into a prime (1223213137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26406 + ... + 56068.

It is an arithmetic number, because the mean of its divisors is an integer number (90059904).

Almost surely, 2^1223213131 is an apocalyptic number.

1223213131 is a deficient number, since it is larger than the sum of its proper divisors (217745333).

1223213131 is a wasteful number, since it uses less digits than its factorization.

1223213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29850.

The product of its digits is 216, while the sum is 19.

The square root of 1223213131 is about 34974.4639844559. The cubic root of 1223213131 is about 1069.4669750314.

Adding to 1223213131 its reverse (1313123221), we get a palindrome (2536336352).

The spelling of 1223213131 in words is "one billion, two hundred twenty-three million, two hundred thirteen thousand, one hundred thirty-one".