31223221220113 has 8 divisors (see below), whose sum is σ = 33625094825448. Its totient is φ = 28821360094464.

The previous prime is 31223221220071. The next prime is 31223221220123. The reversal of 31223221220113 is 31102212232213.

It can be written as a sum of positive squares in 4 ways, for example, as 853059126544 + 30370162093569 = 923612^2 + 5510913^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31223221220113 is a prime.

It is a super-2 number, since 2×31223221220113² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223221220123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2443881 + ... + 8271577.

It is an arithmetic number, because the mean of its divisors is an integer number (4203136853181).

Almost surely, 2^{31223221220113} is an apocalyptic number.

It is an amenable number.

31223221220113 is a deficient number, since it is larger than the sum of its proper divisors (2401873605335).

31223221220113 is a wasteful number, since it uses less digits than its factorization.

31223221220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6239843.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 31223221220113 its reverse (31102212232213), we get a palindrome (62325433452326).

The spelling of 31223221220113 in words is "thirty-one trillion, two hundred twenty-three billion, two hundred twenty-one million, two hundred twenty thousand, one hundred thirteen".