31121030013203 has 24 divisors (see below), whose sum is σ = 34441294099968. Its totient is φ = 28095312247392.

The previous prime is 31121030013191. The next prime is 31121030013233. The reversal of 31121030013203 is 30231003012113.

It is not a de Polignac number, because 31121030013203 - 2⁴ = 31121030013187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121030013233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9425000 + ... + 12291162.

It is an arithmetic number, because the mean of its divisors is an integer number (1435053920832).

Almost surely, 2^{31121030013203} is an apocalyptic number.

31121030013203 is a deficient number, since it is larger than the sum of its proper divisors (3320264086765).

31121030013203 is a wasteful number, since it uses less digits than its factorization.

31121030013203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867603 (or 2867590 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31121030013203 its reverse (30231003012113), we get a palindrome (61352033025316).

The spelling of 31121030013203 in words is "thirty-one trillion, one hundred twenty-one billion, thirty million, thirteen thousand, two hundred three".