31012012110221 has 4 divisors (see below), whose sum is σ = 31012108554492. Its totient is φ = 31011915665952.

The previous prime is 31012012110187. The next prime is 31012012110271. The reversal of 31012012110221 is 12201121021013.

It is a happy number.

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 26213222413225 + 4798789696996 = 5119885^2 + 2190614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31012012110221 is a prime.

It is a super-2 number, since 2×31012012110221² (a number of 28 digits) contains 22 as substring.

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 31012012110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012012110271) 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, 47738186 + ... + 48383451.

It is an arithmetic number, because the mean of its divisors is an integer number (7753027138623).

Almost surely, 2^{31012012110221} is an apocalyptic number.

It is an amenable number.

31012012110221 is a deficient number, since it is larger than the sum of its proper divisors (96444271).

31012012110221 is an equidigital number, since it uses as much as digits as its factorization.

31012012110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96444270.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 31012012110221 its reverse (12201121021013), we get a palindrome (43213133131234).

The spelling of 31012012110221 in words is "thirty-one trillion, twelve billion, twelve million, one hundred ten thousand, two hundred twenty-one".