31113342221 has 4 divisors (see below), whose sum is σ = 33506676252. Its totient is φ = 28720008192.

The previous prime is 31113342203. The next prime is 31113342223. The reversal of 31113342221 is 12224331113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12224331113 = 1451 ⋅8424763.

It can be written as a sum of positive squares in 2 ways, for example, as 7007364100 + 24105978121 = 83710^2 + 155261^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113342221 - 2⁶ = 31113342157 is a prime.

It is a super-2 number, since 2×31113342221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113342223) 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, 1196666996 + ... + 1196667021.

It is an arithmetic number, because the mean of its divisors is an integer number (8376669063).

Almost surely, 2^31113342221 is an apocalyptic number.

It is an amenable number.

31113342221 is a deficient number, since it is larger than the sum of its proper divisors (2393334031).

31113342221 is a wasteful number, since it uses less digits than its factorization.

31113342221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393334030.

The product of its digits is 864, while the sum is 23.

Adding to 31113342221 its reverse (12224331113), we get a palindrome (43337673334).

The spelling of 31113342221 in words is "thirty-one billion, one hundred thirteen million, three hundred forty-two thousand, two hundred twenty-one".