31212103110121 has 4 divisors (see below), whose sum is σ = 31213363364352. Its totient is φ = 31210842855892.

The previous prime is 31212103110113. The next prime is 31212103110169. The reversal of 31212103110121 is 12101130121213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31212103110121 - 2³ = 31212103110113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212103114121) 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, 630089965 + ... + 630139498.

It is an arithmetic number, because the mean of its divisors is an integer number (7803340841088).

Almost surely, 2^{31212103110121} is an apocalyptic number.

It is an amenable number.

31212103110121 is a deficient number, since it is larger than the sum of its proper divisors (1260254231).

31212103110121 is a wasteful number, since it uses less digits than its factorization.

31212103110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260254230.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 31212103110121 its reverse (12101130121213), we get a palindrome (43313233231334).

The spelling of 31212103110121 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, one hundred ten thousand, one hundred twenty-one".