31311020110121 has 4 divisors (see below), whose sum is σ = 31311296376192. Its totient is φ = 31310743844052.

The previous prime is 31311020110109. The next prime is 31311020110177. The reversal of 31311020110121 is 12101102011313.

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 31311020110121 - 2¹⁰ = 31311020109097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31311020110121.

It is not an unprimeable number, because it can be changed into a prime (31311020110021) 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, 137962961 + ... + 138189726.

It is an arithmetic number, because the mean of its divisors is an integer number (7827824094048).

Almost surely, 2^{31311020110121} is an apocalyptic number.

It is an amenable number.

31311020110121 is a deficient number, since it is larger than the sum of its proper divisors (276266071).

31311020110121 is a wasteful number, since it uses less digits than its factorization.

31311020110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276266070.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 31311020110121 its reverse (12101102011313), we get a palindrome (43412122121434).

The spelling of 31311020110121 in words is "thirty-one trillion, three hundred eleven billion, twenty million, one hundred ten thousand, one hundred twenty-one".