1212131113 has 4 divisors (see below), whose sum is σ = 1212220240. Its totient is φ = 1212041988.

The previous prime is 1212131083. The next prime is 1212131131. The reversal of 1212131113 is 3111312121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1212131113 - 2¹³ = 1212122921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212131153) 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, 19443 + ... + 52936.

It is an arithmetic number, because the mean of its divisors is an integer number (303055060).

Almost surely, 2^1212131113 is an apocalyptic number.

It is an amenable number.

1212131113 is a deficient number, since it is larger than the sum of its proper divisors (89127).

1212131113 is an equidigital number, since it uses as much as digits as its factorization.

1212131113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89126.

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

The square root of 1212131113 is about 34815.6733813953. The cubic root of 1212131113 is about 1066.2274673076.

Adding to 1212131113 its reverse (3111312121), we get a palindrome (4323443234).

It can be divided in two parts, 12121 and 31113, that added together give a palindrome (43234).

The spelling of 1212131113 in words is "one billion, two hundred twelve million, one hundred thirty-one thousand, one hundred thirteen".