31320223131221 has 16 divisors (see below), whose sum is σ = 31825936292928. Its totient is φ = 30818364192000.

The previous prime is 31320223131187. The next prime is 31320223131269. The reversal of 31320223131221 is 12213132202313.

It is a cyclic number.

It is not a de Polignac number, because 31320223131221 - 2¹⁰ = 31320223130197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320223131121) 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 15 ways as a sum of consecutive naturals, for example, 495455306 + ... + 495518516.

It is an arithmetic number, because the mean of its divisors is an integer number (1989121018308).

Almost surely, 2^{31320223131221} is an apocalyptic number.

It is an amenable number.

31320223131221 is a deficient number, since it is larger than the sum of its proper divisors (505713161707).

31320223131221 is a wasteful number, since it uses less digits than its factorization.

31320223131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93572.

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

Adding to 31320223131221 its reverse (12213132202313), we get a palindrome (43533355333534).

The spelling of 31320223131221 in words is "thirty-one trillion, three hundred twenty billion, two hundred twenty-three million, one hundred thirty-one thousand, two hundred twenty-one".