31223213201 has 4 divisors (see below), whose sum is σ = 31271924004. Its totient is φ = 31174502400.

The previous prime is 31223213159. The next prime is 31223213221. The reversal of 31223213201 is 10231232213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10231232213 = 17 ⋅601837189.

It can be written as a sum of positive squares in 2 ways, for example, as 30067213201 + 1156000000 = 173399^2 + 34000^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223213201 - 2¹⁴ = 31223196817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31223213221) 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, 24354440 + ... + 24355721.

It is an arithmetic number, because the mean of its divisors is an integer number (7817981001).

Almost surely, 2^31223213201 is an apocalyptic number.

It is an amenable number.

31223213201 is a deficient number, since it is larger than the sum of its proper divisors (48710803).

31223213201 is an equidigital number, since it uses as much as digits as its factorization.

31223213201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48710802.

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

Adding to 31223213201 its reverse (10231232213), we get a palindrome (41454445414).

The spelling of 31223213201 in words is "thirty-one billion, two hundred twenty-three million, two hundred thirteen thousand, two hundred one".