1221310031 has 8 divisors (see below), whose sum is σ = 1265310720. Its totient is φ = 1177435168.

The previous prime is 1221310001. The next prime is 1221310033. The reversal of 1221310031 is 1300131221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221310031 - 2⁶ = 1221309967 is a prime.

It is a super-2 number, since 2×1221310031² = 2983196383642441922, 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 = 1221309988 and 1221310015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221310033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11471 + ... + 50736.

It is an arithmetic number, because the mean of its divisors is an integer number (158163840).

Almost surely, 2^1221310031 is an apocalyptic number.

1221310031 is a deficient number, since it is larger than the sum of its proper divisors (44000689).

1221310031 is an equidigital number, since it uses as much as digits as its factorization.

1221310031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62913.

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

The square root of 1221310031 is about 34947.2464008253. The cubic root of 1221310031 is about 1068.9120542838.

Adding to 1221310031 its reverse (1300131221), we get a palindrome (2521441252).

The spelling of 1221310031 in words is "one billion, two hundred twenty-one million, three hundred ten thousand, thirty-one".