31112001110221 has 4 divisors (see below), whose sum is σ = 31121000824732. Its totient is φ = 31103001395712.

The previous prime is 31112001110213. The next prime is 31112001110237. The reversal of 31112001110221 is 12201110021113.

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 803507860996 + 30308493249225 = 896386^2 + 5505315^2 .

It is a cyclic number.

It is not a de Polignac number, because 31112001110221 - 2³ = 31112001110213 is a prime.

It is a super-2 number, since 2×31112001110221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31112001110195 and 31112001110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112001110291) 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, 4499852070 + ... + 4499858983.

It is an arithmetic number, because the mean of its divisors is an integer number (7780250206183).

Almost surely, 2^{31112001110221} is an apocalyptic number.

It is an amenable number.

31112001110221 is a deficient number, since it is larger than the sum of its proper divisors (8999714511).

31112001110221 is an equidigital number, since it uses as much as digits as its factorization.

31112001110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8999714510.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 31112001110221 its reverse (12201110021113), we get a palindrome (43313111131334).

The spelling of 31112001110221 in words is "thirty-one trillion, one hundred twelve billion, one million, one hundred ten thousand, two hundred twenty-one".