31220320213211 has 8 divisors (see below), whose sum is σ = 31225490360064. Its totient is φ = 31215150348480.

The previous prime is 31220320213177. The next prime is 31220320213283. The reversal of 31220320213211 is 11231202302213.

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 31220320213211 - 2¹⁰ = 31220320212187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220320203211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372368951 + ... + 372452783.

It is an arithmetic number, because the mean of its divisors is an integer number (3903186295008).

Almost surely, 2^{31220320213211} is an apocalyptic number.

31220320213211 is a deficient number, since it is larger than the sum of its proper divisors (5170146853).

31220320213211 is an equidigital number, since it uses as much as digits as its factorization.

31220320213211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141061.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31220320213211 its reverse (11231202302213), we get a palindrome (42451522515424).

The spelling of 31220320213211 in words is "thirty-one trillion, two hundred twenty billion, three hundred twenty million, two hundred thirteen thousand, two hundred eleven".