1213133121 has 24 divisors (see below), whose sum is σ = 1791728640. Its totient is φ = 790600896.

The previous prime is 1213133113. The next prime is 1213133143. The reversal of 1213133121 is 1213313121.

It is not a de Polignac number, because 1213133121 - 2³ = 1213133113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213133094 and 1213133103.

It is not an unprimeable number, because it can be changed into a prime (1213133221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 607701 + ... + 609693.

It is an arithmetic number, because the mean of its divisors is an integer number (74655360).

Almost surely, 2^1213133121 is an apocalyptic number.

It is an amenable number.

1213133121 is a deficient number, since it is larger than the sum of its proper divisors (578595519).

1213133121 is a wasteful number, since it uses less digits than its factorization.

1213133121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485 (or 3482 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1213133121 is about 34830.0605942625. The cubic root of 1213133121 is about 1066.5211853130.

Adding to 1213133121 its reverse (1213313121), we get a palindrome (2426446242).

The spelling of 1213133121 in words is "one billion, two hundred thirteen million, one hundred thirty-three thousand, one hundred twenty-one".