31020221231 has 8 divisors (see below), whose sum is σ = 31142646528. Its totient is φ = 30897855000.

The previous prime is 31020221191. The next prime is 31020221261. The reversal of 31020221231 is 13212202013.

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

It is a cyclic number.

It is not a de Polignac number, because 31020221231 - 2¹⁰ = 31020220207 is a prime.

It is a super-2 number, since 2×31020221231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020221261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1248116 + ... + 1272726.

It is an arithmetic number, because the mean of its divisors is an integer number (3892830816).

Almost surely, 2^31020221231 is an apocalyptic number.

31020221231 is a deficient number, since it is larger than the sum of its proper divisors (122425297).

31020221231 is a wasteful number, since it uses less digits than its factorization.

31020221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29533.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31020221231 its reverse (13212202013), we get a palindrome (44232423244).

The spelling of 31020221231 in words is "thirty-one billion, twenty million, two hundred twenty-one thousand, two hundred thirty-one".