31212330101 has 4 divisors (see below), whose sum is σ = 31243142892. Its totient is φ = 31181517312.

The previous prime is 31212330073. The next prime is 31212330109. The reversal of 31212330101 is 10103321213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10103321213 = 67 ⋅150795839.

It can be written as a sum of positive squares in 2 ways, for example, as 8208541201 + 23003788900 = 90601^2 + 151670^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212330101 - 2¹⁰ = 31212329077 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 31212330101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212330109) 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, 15404876 + ... + 15406901.

It is an arithmetic number, because the mean of its divisors is an integer number (7810785723).

Almost surely, 2^31212330101 is an apocalyptic number.

It is an amenable number.

31212330101 is a deficient number, since it is larger than the sum of its proper divisors (30812791).

31212330101 is a wasteful number, since it uses less digits than its factorization.

31212330101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30812790.

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

Adding to 31212330101 its reverse (10103321213), we get a palindrome (41315651314).

The spelling of 31212330101 in words is "thirty-one billion, two hundred twelve million, three hundred thirty thousand, one hundred one".