10311201221 has 4 divisors (see below), whose sum is σ = 10312279500. Its totient is φ = 10310122944.

The previous prime is 10311201217. The next prime is 10311201253. The reversal of 10311201221 is 12210211301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12210211301 = 29 ⋅421041769.

It can be written as a sum of positive squares in 2 ways, for example, as 1881390625 + 8429810596 = 43375^2 + 91814^2 .

It is a cyclic number.

It is not a de Polignac number, because 10311201221 - 2² = 10311201217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10311201196 and 10311201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10311201421) 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, 524666 + ... + 543963.

It is an arithmetic number, because the mean of its divisors is an integer number (2578069875).

Almost surely, 2^10311201221 is an apocalyptic number.

It is an amenable number.

10311201221 is a deficient number, since it is larger than the sum of its proper divisors (1078279).

10311201221 is an equidigital number, since it uses as much as digits as its factorization.

10311201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078278.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 10311201221 its reverse (12210211301), we get a palindrome (22521412522).

The spelling of 10311201221 in words is "ten billion, three hundred eleven million, two hundred one thousand, two hundred twenty-one".