31302213221 has 8 divisors (see below), whose sum is σ = 32032577280. Its totient is φ = 30571958592.

The previous prime is 31302213209. The next prime is 31302213247. The reversal of 31302213221 is 12231220313.

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 31302213221 - 2¹⁰ = 31302212197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31302213193 and 31302213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31302213721) 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, 970685 + ... + 1002413.

It is an arithmetic number, because the mean of its divisors is an integer number (4004072160).

Almost surely, 2^31302213221 is an apocalyptic number.

It is an amenable number.

31302213221 is a deficient number, since it is larger than the sum of its proper divisors (730364059).

31302213221 is a wasteful number, since it uses less digits than its factorization.

31302213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54715.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31302213221 its reverse (12231220313), we get a palindrome (43533433534).

The spelling of 31302213221 in words is "thirty-one billion, three hundred two million, two hundred thirteen thousand, two hundred twenty-one".