1131211210121 has 4 divisors (see below), whose sum is σ = 1137530826000. Its totient is φ = 1124891594244.

The previous prime is 1131211210111. The next prime is 1131211210127. The reversal of 1131211210121 is 1210121121311.

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 1131211210121 - 2³⁰ = 1130137468297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131211210121.

It is not an unprimeable number, because it can be changed into a prime (1131211210127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3159807671 + ... + 3159808028.

It is an arithmetic number, because the mean of its divisors is an integer number (284382706500).

Almost surely, 2^{1131211210121} is an apocalyptic number.

It is an amenable number.

1131211210121 is a deficient number, since it is larger than the sum of its proper divisors (6319615879).

1131211210121 is an equidigital number, since it uses as much as digits as its factorization.

1131211210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319615878.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 1131211210121 its reverse (1210121121311), we get a palindrome (2341332331432).

The spelling of 1131211210121 in words is "one trillion, one hundred thirty-one billion, two hundred eleven million, two hundred ten thousand, one hundred twenty-one".