31201133321 has 4 divisors (see below), whose sum is σ = 32277034500. Its totient is φ = 30125232144.

The previous prime is 31201133317. The next prime is 31201133401. The reversal of 31201133321 is 12333110213.

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 21217126921 + 9984006400 = 145661^2 + 99920^2 .

It is a cyclic number.

It is not a de Polignac number, because 31201133321 - 2² = 31201133317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31201133293 and 31201133302.

It is not an unprimeable number, because it can be changed into a prime (31201133221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537950546 + ... + 537950603.

It is an arithmetic number, because the mean of its divisors is an integer number (8069258625).

Almost surely, 2^31201133321 is an apocalyptic number.

It is an amenable number.

31201133321 is a deficient number, since it is larger than the sum of its proper divisors (1075901179).

31201133321 is a wasteful number, since it uses less digits than its factorization.

31201133321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075901178.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31201133321 its reverse (12333110213), we get a palindrome (43534243534).

The spelling of 31201133321 in words is "thirty-one billion, two hundred one million, one hundred thirty-three thousand, three hundred twenty-one".