31103201110021 has 4 divisors (see below), whose sum is σ = 31109663446252. Its totient is φ = 31096738773792.

The previous prime is 31103201109977. The next prime is 31103201110063. The reversal of 31103201110021 is 12001110230113.

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 19740160140100 + 11363040969921 = 4442990^2 + 3370911^2 .

It is a cyclic number.

It is not a de Polignac number, because 31103201110021 - 2²⁵ = 31103167555589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31103201109977 and 31103201110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103201110621) 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, 3231160896 + ... + 3231170521.

It is an arithmetic number, because the mean of its divisors is an integer number (7777415861563).

Almost surely, 2^{31103201110021} is an apocalyptic number.

It is an amenable number.

31103201110021 is a deficient number, since it is larger than the sum of its proper divisors (6462336231).

31103201110021 is an equidigital number, since it uses as much as digits as its factorization.

31103201110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462336230.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 31103201110021 its reverse (12001110230113), we get a palindrome (43104311340134).

The spelling of 31103201110021 in words is "thirty-one trillion, one hundred three billion, two hundred one million, one hundred ten thousand, twenty-one".