1156212313121 has 12 divisors (see below), whose sum is σ = 1194889244976. Its totient is φ = 1118749723560.

The previous prime is 1156212313063. The next prime is 1156212313127. The reversal of 1156212313121 is 1213132126511.

It is a happy number.

It is not a de Polignac number, because 1156212313121 - 2⁶ = 1156212313057 is a prime.

It is a super-2 number, since 2×1156212313121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156212313127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6682910 + ... + 6853736.

It is an arithmetic number, because the mean of its divisors is an integer number (99574103748).

Almost surely, 2^{1156212313121} is an apocalyptic number.

It is an amenable number.

1156212313121 is a deficient number, since it is larger than the sum of its proper divisors (38676931855).

1156212313121 is an equidigital number, since it uses as much as digits as its factorization.

1156212313121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177932 (or 177901 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

Adding to 1156212313121 its reverse (1213132126511), we get a palindrome (2369344439632).

The spelling of 1156212313121 in words is "one trillion, one hundred fifty-six billion, two hundred twelve million, three hundred thirteen thousand, one hundred twenty-one".