31320213101 has 4 divisors (see below), whose sum is σ = 31911160572. Its totient is φ = 30729265632.

The previous prime is 31320213097. The next prime is 31320213157. The reversal of 31320213101 is 10131202313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10131202313 = 307 ⋅33000659.

It can be written as a sum of positive squares in 2 ways, for example, as 14614392100 + 16705821001 = 120890^2 + 129251^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320213101 - 2² = 31320213097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31320213101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320213901) 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, 295473656 + ... + 295473761.

It is an arithmetic number, because the mean of its divisors is an integer number (7977790143).

Almost surely, 2^31320213101 is an apocalyptic number.

It is an amenable number.

31320213101 is a deficient number, since it is larger than the sum of its proper divisors (590947471).

31320213101 is an equidigital number, since it uses as much as digits as its factorization.

31320213101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590947470.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31320213101 its reverse (10131202313), we get a palindrome (41451415414).

The spelling of 31320213101 in words is "thirty-one billion, three hundred twenty million, two hundred thirteen thousand, one hundred one".