10031312221 has 4 divisors (see below), whose sum is σ = 11464356832. Its totient is φ = 8598267612.

The previous prime is 10031312089. The next prime is 10031312231. The reversal of 10031312221 is 12221313001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12221313001 = 1627 ⋅7511563.

It is a cyclic number.

It is not a de Polignac number, because 10031312221 - 2⁹ = 10031311709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10031312195 and 10031312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10031312231) 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, 716522295 + ... + 716522308.

It is an arithmetic number, because the mean of its divisors is an integer number (2866089208).

Almost surely, 2^10031312221 is an apocalyptic number.

It is an amenable number.

10031312221 is a deficient number, since it is larger than the sum of its proper divisors (1433044611).

10031312221 is an equidigital number, since it uses as much as digits as its factorization.

10031312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433044610.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 10031312221 its reverse (12221313001), we get a palindrome (22252625222).

The spelling of 10031312221 in words is "ten billion, thirty-one million, three hundred twelve thousand, two hundred twenty-one".