31201231222321 has 4 divisors (see below), whose sum is σ = 31373613715444. Its totient is φ = 31028848729200.

The previous prime is 31201231222283. The next prime is 31201231222387. The reversal of 31201231222321 is 12322213210213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10653278212096 + 20547953010225 = 3263936^2 + 4532985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31201231222321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31201231222621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86191246290 + ... + 86191246651.

It is an arithmetic number, because the mean of its divisors is an integer number (7843403428861).

Almost surely, 2^{31201231222321} is an apocalyptic number.

It is an amenable number.

31201231222321 is a deficient number, since it is larger than the sum of its proper divisors (172382493123).

31201231222321 is a wasteful number, since it uses less digits than its factorization.

31201231222321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172382493122.

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

Adding to 31201231222321 its reverse (12322213210213), we get a palindrome (43523444432534).

The spelling of 31201231222321 in words is "thirty-one trillion, two hundred one billion, two hundred thirty-one million, two hundred twenty-two thousand, three hundred twenty-one".