1215121451131 has 4 divisors (see below), whose sum is σ = 1388710229872. Its totient is φ = 1041532672392.

The previous prime is 1215121451111. The next prime is 1215121451197. The reversal of 1215121451131 is 1311541215121.

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

It is a cyclic number.

It is not a de Polignac number, because 1215121451131 - 2⁵ = 1215121451099 is a prime.

It is a super-2 number, since 2×1215121451131² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1215121451131.

It is not an unprimeable number, because it can be changed into a prime (1215121451111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86794389360 + ... + 86794389373.

It is an arithmetic number, because the mean of its divisors is an integer number (347177557468).

Almost surely, 2^{1215121451131} is an apocalyptic number.

1215121451131 is a deficient number, since it is larger than the sum of its proper divisors (173588778741).

1215121451131 is an equidigital number, since it uses as much as digits as its factorization.

1215121451131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173588778740.

The product of its digits is 1200, while the sum is 28.

Adding to 1215121451131 its reverse (1311541215121), we get a palindrome (2526662666252).

The spelling of 1215121451131 in words is "one trillion, two hundred fifteen billion, one hundred twenty-one million, four hundred fifty-one thousand, one hundred thirty-one".