31220221331231 has 8 divisors (see below), whose sum is σ = 32893513161600. Its totient is φ = 29549941729560.

The previous prime is 31220221331197. The next prime is 31220221331249. The reversal of 31220221331231 is 13213312202213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31220221331231 - 2¹⁴ = 31220221314847 is a prime.

It is a super-2 number, since 2×31220221331231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31220221331231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220221331731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753035891 + ... + 753077348.

It is an arithmetic number, because the mean of its divisors is an integer number (4111689145200).

Almost surely, 2^{31220221331231} is an apocalyptic number.

31220221331231 is a deficient number, since it is larger than the sum of its proper divisors (1673291830369).

31220221331231 is a wasteful number, since it uses less digits than its factorization.

31220221331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506114349.

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

Adding to 31220221331231 its reverse (13213312202213), we get a palindrome (44433533533444).

The spelling of 31220221331231 in words is "thirty-one trillion, two hundred twenty billion, two hundred twenty-one million, three hundred thirty-one thousand, two hundred thirty-one".