31112221201 has 4 divisors (see below), whose sum is σ = 31251738112. Its totient is φ = 30972704292.

The previous prime is 31112221181. The next prime is 31112221207. The reversal of 31112221201 is 10212221113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10212221113 = 17 ⋅600718889.

It is a cyclic number.

It is not a de Polignac number, because 31112221201 - 2¹¹ = 31112219153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31112221207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69758121 + ... + 69758566.

It is an arithmetic number, because the mean of its divisors is an integer number (7812934528).

Almost surely, 2^31112221201 is an apocalyptic number.

It is an amenable number.

31112221201 is a deficient number, since it is larger than the sum of its proper divisors (139516911).

31112221201 is a wasteful number, since it uses less digits than its factorization.

31112221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139516910.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31112221201 its reverse (10212221113), we get a palindrome (41324442314).

The spelling of 31112221201 in words is "thirty-one billion, one hundred twelve million, two hundred twenty-one thousand, two hundred one".