1320121031 has 4 divisors (see below), whose sum is σ = 1331803632. Its totient is φ = 1308438432.

The previous prime is 1320121013. The next prime is 1320121037. The reversal of 1320121031 is 1301210231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1301210231 = 19 ⋅68484749.

It is a cyclic number.

It is not a de Polignac number, because 1320121031 - 2¹⁴ = 1320104647 is a prime.

It is a super-2 number, since 2×1320121031² = 3485439072977005922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320120997 and 1320121015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320121037) 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, 5841131 + ... + 5841356.

It is an arithmetic number, because the mean of its divisors is an integer number (332950908).

Almost surely, 2^1320121031 is an apocalyptic number.

1320121031 is a deficient number, since it is larger than the sum of its proper divisors (11682601).

1320121031 is a wasteful number, since it uses less digits than its factorization.

1320121031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11682600.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1320121031 is about 36333.4698453093. The cubic root of 1320121031 is about 1096.9948363115.

Adding to 1320121031 its reverse (1301210231), we get a palindrome (2621331262).

The spelling of 1320121031 in words is "one billion, three hundred twenty million, one hundred twenty-one thousand, thirty-one".