31311312220322 has 4 divisors (see below), whose sum is σ = 46966968330486. Its totient is φ = 15655656110160.

The previous prime is 31311312220301. The next prime is 31311312220333. The reversal of 31311312220322 is 22302221311313.

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

It can be written as a sum of positive squares in only one way, i.e., 22511314562881 + 8799997657441 = 4744609^2 + 2966479^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31311312220291 and 31311312220300.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7827828055079 + ... + 7827828055082.

Almost surely, 2^{31311312220322} is an apocalyptic number.

31311312220322 is a deficient number, since it is larger than the sum of its proper divisors (15655656110164).

31311312220322 is a wasteful number, since it uses less digits than its factorization.

31311312220322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15655656110163.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31311312220322 its reverse (22302221311313), we get a palindrome (53613533531635).

Subtracting from 31311312220322 its reverse (22302221311313), we obtain a palindrome (9009090909009).

The spelling of 31311312220322 in words is "thirty-one trillion, three hundred eleven billion, three hundred twelve million, two hundred twenty thousand, three hundred twenty-two".