31220323133321 has 16 divisors (see below), whose sum is σ = 35871388900224. Its totient is φ = 26617059800064.

The previous prime is 31220323133291. The next prime is 31220323133339. The reversal of 31220323133321 is 12333132302213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220323133321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220323133341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5916395 + ... + 9871391.

It is an arithmetic number, because the mean of its divisors is an integer number (2241961806264).

Almost surely, 2^{31220323133321} is an apocalyptic number.

It is an amenable number.

31220323133321 is a deficient number, since it is larger than the sum of its proper divisors (4651065766903).

31220323133321 is a wasteful number, since it uses less digits than its factorization.

31220323133321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961040.

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 31220323133321 its reverse (12333132302213), we get a palindrome (43553455435534).

The spelling of 31220323133321 in words is "thirty-one trillion, two hundred twenty billion, three hundred twenty-three million, one hundred thirty-three thousand, three hundred twenty-one".