31222220133133 has 6 divisors (see below), whose sum is σ = 31965204280974. Its totient is φ = 30496121988696.

The previous prime is 31222220133127. The next prime is 31222220133329. The reversal of 31222220133133 is 33133102222213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 31222145431684 + 74701449 = 5587678^2 + 8643^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31222220133133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222220131133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8442999810 + ... + 8443003507.

It is an arithmetic number, because the mean of its divisors is an integer number (5327534046829).

Almost surely, 2^{31222220133133} is an apocalyptic number.

It is an amenable number.

31222220133133 is a deficient number, since it is larger than the sum of its proper divisors (742984147841).

31222220133133 is an equidigital number, since it uses as much as digits as its factorization.

31222220133133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16886003403 (or 16886003360 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 31222220133133 its reverse (33133102222213), we get a palindrome (64355322355346).

The spelling of 31222220133133 in words is "thirty-one trillion, two hundred twenty-two billion, two hundred twenty million, one hundred thirty-three thousand, one hundred thirty-three".