113231212121 has 16 divisors (see below), whose sum is σ = 117095908608. Its totient is φ = 109423785600.

The previous prime is 113231212091. The next prime is 113231212151. The reversal of 113231212121 is 121212132311.

It is an interprime number because it is at equal distance from previous prime (113231212091) and next prime (113231212151).

It is a cyclic number.

It is not a de Polignac number, because 113231212121 - 2²² = 113227017817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113231212093 and 113231212102.

It is not an unprimeable number, because it can be changed into a prime (113231212151) 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, 1892750 + ... + 1951656.

It is an arithmetic number, because the mean of its divisors is an integer number (7318494288).

Almost surely, 2^113231212121 is an apocalyptic number.

It is an amenable number.

113231212121 is a deficient number, since it is larger than the sum of its proper divisors (3864696487).

113231212121 is a wasteful number, since it uses less digits than its factorization.

113231212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59392.

The product of its digits is 144, while the sum is 20.

Adding to 113231212121 its reverse (121212132311), we get a palindrome (234443344432).

The spelling of 113231212121 in words is "one hundred thirteen billion, two hundred thirty-one million, two hundred twelve thousand, one hundred twenty-one".