12151213331 has 4 divisors (see below), whose sum is σ = 12332574792. Its totient is φ = 11969851872.

The previous prime is 12151213307. The next prime is 12151213367. The reversal of 12151213331 is 13331215121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12151213331 is a prime.

It is a super-2 number, since 2×12151213331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12151213297 and 12151213306.

It is not an unprimeable number, because it can be changed into a prime (12151213631) 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, 90680630 + ... + 90680763.

It is an arithmetic number, because the mean of its divisors is an integer number (3083143698).

Almost surely, 2^12151213331 is an apocalyptic number.

12151213331 is a deficient number, since it is larger than the sum of its proper divisors (181361461).

12151213331 is an equidigital number, since it uses as much as digits as its factorization.

12151213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181361460.

The product of its digits is 540, while the sum is 23.

Adding to 12151213331 its reverse (13331215121), we get a palindrome (25482428452).

The spelling of 12151213331 in words is "twelve billion, one hundred fifty-one million, two hundred thirteen thousand, three hundred thirty-one".