31212103121103 has 16 divisors (see below), whose sum is σ = 42502678073856. Its totient is φ = 20364821184000.

The previous prime is 31212103121081. The next prime is 31212103121113. The reversal of 31212103121103 is 30112130121213.

It is not a de Polignac number, because 31212103121103 - 2⁹ = 31212103120591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31212103121103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212103121113) 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, 2710728 + ... + 8352978.

It is an arithmetic number, because the mean of its divisors is an integer number (2656417379616).

Almost surely, 2^{31212103121103} is an apocalyptic number.

31212103121103 is a deficient number, since it is larger than the sum of its proper divisors (11290574952753).

31212103121103 is a wasteful number, since it uses less digits than its factorization.

31212103121103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5681534.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31212103121103 its reverse (30112130121213), we get a palindrome (61324233242316).

The spelling of 31212103121103 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, one hundred twenty-one thousand, one hundred three".