10311231221 has 4 divisors (see below), whose sum is σ = 10917774252. Its totient is φ = 9704688192.

The previous prime is 10311231199. The next prime is 10311231233. The reversal of 10311231221 is 12213211301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8765640625 + 1545590596 = 93625^2 + 39314^2 .

It is a cyclic number.

It is not a de Polignac number, because 10311231221 - 2¹⁰ = 10311230197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 606543013 = 10311231221 / (1 + 0 + 3 + 1 + 1 + 2 + 3 + 1 + 2 + 2 + 1).

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 10311231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10311231121) 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, 303271490 + ... + 303271523.

It is an arithmetic number, because the mean of its divisors is an integer number (2729443563).

Almost surely, 2^10311231221 is an apocalyptic number.

It is an amenable number.

10311231221 is a deficient number, since it is larger than the sum of its proper divisors (606543031).

10311231221 is an equidigital number, since it uses as much as digits as its factorization.

10311231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606543030.

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

Adding to 10311231221 its reverse (12213211301), we get a palindrome (22524442522).

The spelling of 10311231221 in words is "ten billion, three hundred eleven million, two hundred thirty-one thousand, two hundred twenty-one".