31130021122103 has 4 divisors (see below), whose sum is σ = 31971373044360. Its totient is φ = 30288669199848.

The previous prime is 31130021122087. The next prime is 31130021122229. The reversal of 31130021122103 is 30122112003113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31130021122103 - 2⁴ = 31130021122087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130021125103) 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, 420675961073 + ... + 420675961146.

It is an arithmetic number, because the mean of its divisors is an integer number (7992843261090).

Almost surely, 2^{31130021122103} is an apocalyptic number.

31130021122103 is a deficient number, since it is larger than the sum of its proper divisors (841351922257).

31130021122103 is an equidigital number, since it uses as much as digits as its factorization.

31130021122103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841351922256.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31130021122103 its reverse (30122112003113), we get a palindrome (61252133125216).

The spelling of 31130021122103 in words is "thirty-one trillion, one hundred thirty billion, twenty-one million, one hundred twenty-two thousand, one hundred three".