31121200123 has 8 divisors (see below), whose sum is σ = 33580990800. Its totient is φ = 28670816928.

The previous prime is 31121200109. The next prime is 31121200133. The reversal of 31121200123 is 32100212113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31121200123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31121200097 and 31121200106.

It is not an unprimeable number, because it can be changed into a prime (31121200133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2344993 + ... + 2358226.

It is an arithmetic number, because the mean of its divisors is an integer number (4197623850).

Almost surely, 2^31121200123 is an apocalyptic number.

31121200123 is a deficient number, since it is larger than the sum of its proper divisors (2459790677).

31121200123 is a wasteful number, since it uses less digits than its factorization.

31121200123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703741.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31121200123 its reverse (32100212113), we get a palindrome (63221412236).

The spelling of 31121200123 in words is "thirty-one billion, one hundred twenty-one million, two hundred thousand, one hundred twenty-three".