31322320221 has 4 divisors (see below), whose sum is σ = 41763093632. Its totient is φ = 20881546812.

The previous prime is 31322320219. The next prime is 31322320243. The reversal of 31322320221 is 12202322313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31322320221 - 2¹ = 31322320219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31322320201) 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, 5220386701 + ... + 5220386706.

It is an arithmetic number, because the mean of its divisors is an integer number (10440773408).

Almost surely, 2^31322320221 is an apocalyptic number.

It is an amenable number.

31322320221 is a deficient number, since it is larger than the sum of its proper divisors (10440773411).

31322320221 is a wasteful number, since it uses less digits than its factorization.

31322320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10440773410.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31322320221 its reverse (12202322313), we get a palindrome (43524642534).

The spelling of 31322320221 in words is "thirty-one billion, three hundred twenty-two million, three hundred twenty thousand, two hundred twenty-one".