31121323101 has 48 divisors (see below), whose sum is σ = 50428490112. Its totient is φ = 18330777600.

The previous prime is 31121323081. The next prime is 31121323193. The reversal of 31121323101 is 10132312113.

31121323101 is a `hidden beast` number, since 311 + 21 + 323 + 10 + 1 = 666.

It is not a de Polignac number, because 31121323101 - 2²⁶ = 31054214237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121323601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1052941 + ... + 1082093.

It is an arithmetic number, because the mean of its divisors is an integer number (1050593544).

Almost surely, 2^31121323101 is an apocalyptic number.

It is an amenable number.

31121323101 is a deficient number, since it is larger than the sum of its proper divisors (19307167011).

31121323101 is a wasteful number, since it uses less digits than its factorization.

31121323101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29474 (or 29471 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31121323101 its reverse (10132312113), we get a palindrome (41253635214).

The spelling of 31121323101 in words is "thirty-one billion, one hundred twenty-one million, three hundred twenty-three thousand, one hundred one".