1213333121 has 16 divisors (see below), whose sum is σ = 1629091968. Its totient is φ = 872726400.

The previous prime is 1213333111. The next prime is 1213333139.

1213333121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1213333121 - 2²⁶ = 1146224257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213333093 and 1213333102.

It is not an unprimeable number, because it can be changed into a prime (1213333111) 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, 605060 + ... + 607061.

It is an arithmetic number, because the mean of its divisors is an integer number (101818248).

Almost surely, 2^1213333121 is an apocalyptic number.

1213333121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213333121 is a deficient number, since it is larger than the sum of its proper divisors (415758847).

1213333121 is a wasteful number, since it uses less digits than its factorization.

1213333121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212152.

The product of its digits is 324, while the sum is 20.

The square root of 1213333121 is about 34832.9315590864. The cubic root of 1213333121 is about 1066.5797918287.

It can be divided in two parts, 12133 and 33121, that added together give a palindrome (45254).

The spelling of 1213333121 in words is "one billion, two hundred thirteen million, three hundred thirty-three thousand, one hundred twenty-one".