1211309131121 has 4 divisors (see below), whose sum is σ = 1229388371952. Its totient is φ = 1193229890292.

The previous prime is 1211309131093. The next prime is 1211309131139. The reversal of 1211309131121 is 1211319031121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211309131121 - 2³⁸ = 936431224177 is a prime.

It is a super-2 number, since 2×1211309131121² (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 (1211309131141) 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, 9039620315 + ... + 9039620448.

It is an arithmetic number, because the mean of its divisors is an integer number (307347092988).

Almost surely, 2^{1211309131121} is an apocalyptic number.

It is an amenable number.

1211309131121 is a deficient number, since it is larger than the sum of its proper divisors (18079240831).

1211309131121 is an equidigital number, since it uses as much as digits as its factorization.

1211309131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18079240830.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 1211309131121 in words is "one trillion, two hundred eleven billion, three hundred nine million, one hundred thirty-one thousand, one hundred twenty-one".