10311131221 has 4 divisors (see below), whose sum is σ = 10666687500. Its totient is φ = 9955574944.

The previous prime is 10311131213. The next prime is 10311131231. The reversal of 10311131221 is 12213111301.

It is a happy number.

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 8510062500 + 1801068721 = 92250^2 + 42439^2 .

It is a cyclic number.

It is not a de Polignac number, because 10311131221 - 2³ = 10311131213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10311131195 and 10311131204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10311131231) 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, 177778096 + ... + 177778153.

It is an arithmetic number, because the mean of its divisors is an integer number (2666671875).

Almost surely, 2^10311131221 is an apocalyptic number.

It is an amenable number.

10311131221 is a deficient number, since it is larger than the sum of its proper divisors (355556279).

10311131221 is an equidigital number, since it uses as much as digits as its factorization.

10311131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355556278.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 10311131221 its reverse (12213111301), we get a palindrome (22524242522).

The spelling of 10311131221 in words is "ten billion, three hundred eleven million, one hundred thirty-one thousand, two hundred twenty-one".