31211122103 has 16 divisors (see below), whose sum is σ = 39755877120. Its totient is φ = 23853522816.

The previous prime is 31211122057. The next prime is 31211122157. The reversal of 31211122103 is 30122111213.

It is a cyclic number.

It is not a de Polignac number, because 31211122103 - 2²² = 31206927799 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211124103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6899801 + ... + 6904322.

It is an arithmetic number, because the mean of its divisors is an integer number (2484742320).

Almost surely, 2^31211122103 is an apocalyptic number.

31211122103 is a deficient number, since it is larger than the sum of its proper divisors (8544755017).

31211122103 is a wasteful number, since it uses less digits than its factorization.

31211122103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13804166.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31211122103 its reverse (30122111213), we get a palindrome (61333233316).

The spelling of 31211122103 in words is "thirty-one billion, two hundred eleven million, one hundred twenty-two thousand, one hundred three".