1321031121 has 16 divisors (see below), whose sum is σ = 1873839168. Its totient is φ = 824947200.

The previous prime is 1321031099. The next prime is 1321031123. The reversal of 1321031121 is 1211301231.

It is a happy number.

It is not a de Polignac number, because 1321031121 - 2⁶ = 1321031057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321031121.

It is not an unprimeable number, because it can be changed into a prime (1321031123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50620 + ... + 72141.

It is an arithmetic number, because the mean of its divisors is an integer number (117114948).

Almost surely, 2^1321031121 is an apocalyptic number.

It is an amenable number.

1321031121 is a deficient number, since it is larger than the sum of its proper divisors (552808047).

1321031121 is a wasteful number, since it uses less digits than its factorization.

1321031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122992.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1321031121 is about 36345.9918147792. The cubic root of 1321031121 is about 1097.2468674185.

Adding to 1321031121 its reverse (1211301231), we get a palindrome (2532332352).

The spelling of 1321031121 in words is "one billion, three hundred twenty-one million, thirty-one thousand, one hundred twenty-one".