1213113121 has 24 divisors (see below), whose sum is σ = 1409450400. Its totient is φ = 1032624000.

The previous prime is 1213113113. The next prime is 1213113133.

It is a happy number.

1213113121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1213113121 - 2³ = 1213113113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213113095 and 1213113104.

It is not an unprimeable number, because it can be changed into a prime (1213111121) 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, 2131725 + ... + 2132293.

It is an arithmetic number, because the mean of its divisors is an integer number (58727100).

Almost surely, 2^1213113121 is an apocalyptic number.

1213113121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213113121 is a deficient number, since it is larger than the sum of its proper divisors (196337279).

1213113121 is a wasteful number, since it uses less digits than its factorization.

1213113121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 700 counting only the distinct ones).

The product of its digits is 36, while the sum is 16.

The square root of 1213113121 is about 34829.7734847644. The cubic root of 1213113121 is about 1066.5153243071.

It can be divided in two parts, 12131 and 13121, that added together give a palindrome (25252).

The spelling of 1213113121 in words is "one billion, two hundred thirteen million, one hundred thirteen thousand, one hundred twenty-one".