1213113222031 has 4 divisors (see below), whose sum is σ = 1231219389592. Its totient is φ = 1195007054472.

The previous prime is 1213113221923. The next prime is 1213113222037. The reversal of 1213113222031 is 1302223113121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213113222031 - 2⁹ = 1213113221519 is a prime.

It is a super-2 number, since 2×1213113222031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213113221993 and 1213113222011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213113222037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9053083680 + ... + 9053083813.

It is an arithmetic number, because the mean of its divisors is an integer number (307804847398).

Almost surely, 2^{1213113222031} is an apocalyptic number.

1213113222031 is a deficient number, since it is larger than the sum of its proper divisors (18106167561).

1213113222031 is an equidigital number, since it uses as much as digits as its factorization.

1213113222031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18106167560.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1213113222031 its reverse (1302223113121), we get a palindrome (2515336335152).

The spelling of 1213113222031 in words is "one trillion, two hundred thirteen billion, one hundred thirteen million, two hundred twenty-two thousand, thirty-one".