31330212101 has 4 divisors (see below), whose sum is σ = 33173165772. Its totient is φ = 29487258432.

The previous prime is 31330212073. The next prime is 31330212107. The reversal of 31330212101 is 10121203313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25840884001 + 5489328100 = 160751^2 + 74090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31330212101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1842953653 = 31330212101 / (3 + 1 + 3 + 3 + 0 + 2 + 1 + 2 + 1 + 0 + 1).

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 31330212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330212107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921476810 + ... + 921476843.

It is an arithmetic number, because the mean of its divisors is an integer number (8293291443).

Almost surely, 2^31330212101 is an apocalyptic number.

It is an amenable number.

31330212101 is a deficient number, since it is larger than the sum of its proper divisors (1842953671).

31330212101 is a wasteful number, since it uses less digits than its factorization.

31330212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842953670.

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

Adding to 31330212101 its reverse (10121203313), we get a palindrome (41451415414).

The spelling of 31330212101 in words is "thirty-one billion, three hundred thirty million, two hundred twelve thousand, one hundred one".