3121311012231 has 4 divisors (see below), whose sum is σ = 4161748016312. Its totient is φ = 2080874008152.

The previous prime is 3121311012199. The next prime is 3121311012233. The reversal of 3121311012231 is 1322101131213.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3121311012231 - 2⁵ = 3121311012199 is a prime.

It is a super-2 number, since 2×3121311012231² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3121311012198 and 3121311012207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121311012233) 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, 520218502036 + ... + 520218502041.

It is an arithmetic number, because the mean of its divisors is an integer number (1040437004078).

Almost surely, 2^{3121311012231} is an apocalyptic number.

3121311012231 is a deficient number, since it is larger than the sum of its proper divisors (1040437004081).

3121311012231 is a wasteful number, since it uses less digits than its factorization.

3121311012231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040437004080.

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

Adding to 3121311012231 its reverse (1322101131213), we get a palindrome (4443412143444).

The spelling of 3121311012231 in words is "three trillion, one hundred twenty-one billion, three hundred eleven million, twelve thousand, two hundred thirty-one".