1212331121 has 4 divisors (see below), whose sum is σ = 1240524912. Its totient is φ = 1184137332.

The previous prime is 1212331093. The next prime is 1212331129. The reversal of 1212331121 is 1211332121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1211332121 = 1907 ⋅635203.

It is a cyclic number.

It is not a de Polignac number, because 1212331121 - 2²² = 1208136817 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 1212331121.

It is not an unprimeable number, because it can be changed into a prime (1212331129) 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, 14096831 + ... + 14096916.

It is an arithmetic number, because the mean of its divisors is an integer number (310131228).

Almost surely, 2^1212331121 is an apocalyptic number.

It is an amenable number.

1212331121 is a deficient number, since it is larger than the sum of its proper divisors (28193791).

1212331121 is an equidigital number, since it uses as much as digits as its factorization.

1212331121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28193790.

The product of its digits is 72, while the sum is 17.

The square root of 1212331121 is about 34818.5456473989. The cubic root of 1212331121 is about 1066.2861084597.

Adding to 1212331121 its reverse (1211332121), we get a palindrome (2423663242).

The spelling of 1212331121 in words is "one billion, two hundred twelve million, three hundred thirty-one thousand, one hundred twenty-one".