31012243321 has 2 divisors, whose sum is σ = 31012243322. Its totient is φ = 31012243320.

The previous prime is 31012243313. The next prime is 31012243363. The reversal of 31012243321 is 12334221013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16419603321 + 14592640000 = 128139^2 + 120800^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012243321 - 2³ = 31012243313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31012243292 and 31012243301.

It is not a weakly prime, because it can be changed into another prime (31012243621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506121660 + 15506121661.

It is an arithmetic number, because the mean of its divisors is an integer number (15506121661).

Almost surely, 2^31012243321 is an apocalyptic number.

It is an amenable number.

31012243321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012243321 is an equidigital number, since it uses as much as digits as its factorization.

31012243321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31012243321 its reverse (12334221013), we get a palindrome (43346464334).

It can be divided in two parts, 3101 and 2243321, that added together give a palindrome (2246422).

The spelling of 31012243321 in words is "thirty-one billion, twelve million, two hundred forty-three thousand, three hundred twenty-one".