31221002231 has 8 divisors (see below), whose sum is σ = 33140807280. Its totient is φ = 29310450048.

The previous prime is 31221002209. The next prime is 31221002237. The reversal of 31221002231 is 13220012213.

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 31221002231 - 2⁶ = 31221002167 is a prime.

It is a super-2 number, since 2×31221002231² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221002237) 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 7 ways as a sum of consecutive naturals, for example, 2306261 + ... + 2319758.

It is an arithmetic number, because the mean of its divisors is an integer number (4142600910).

Almost surely, 2^31221002231 is an apocalyptic number.

31221002231 is a deficient number, since it is larger than the sum of its proper divisors (1919805049).

31221002231 is a wasteful number, since it uses less digits than its factorization.

31221002231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4626433.

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

Adding to 31221002231 its reverse (13220012213), we get a palindrome (44441014444).

The spelling of 31221002231 in words is "thirty-one billion, two hundred twenty-one million, two thousand, two hundred thirty-one".