31012123121 has 8 divisors (see below), whose sum is σ = 36023450304. Its totient is φ = 26146051920.

The previous prime is 31012123091. The next prime is 31012123123. The reversal of 31012123121 is 12132121013.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31012123121 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 31012123121.

It is not an unprimeable number, because it can be changed into a prime (31012123123) 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, 36313535 + ... + 36314388.

It is an arithmetic number, because the mean of its divisors is an integer number (4502931288).

Almost surely, 2^31012123121 is an apocalyptic number.

It is an amenable number.

31012123121 is a deficient number, since it is larger than the sum of its proper divisors (5011327183).

31012123121 is an equidigital number, since it uses as much as digits as its factorization.

31012123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72627991.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31012123121 its reverse (12132121013), we get a palindrome (43144244134).

The spelling of 31012123121 in words is "thirty-one billion, twelve million, one hundred twenty-three thousand, one hundred twenty-one".