31031012121 has 8 divisors (see below), whose sum is σ = 42709350144. Its totient is φ = 20020007760.

The previous prime is 31031012107. The next prime is 31031012123. The reversal of 31031012121 is 12121013013.

It is a happy number.

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

It is not a de Polignac number, because 31031012121 - 2¹⁰ = 31031011097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31031012121.

It is not an unprimeable number, because it can be changed into a prime (31031012123) 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, 166833306 + ... + 166833491.

It is an arithmetic number, because the mean of its divisors is an integer number (5338668768).

Almost surely, 2^31031012121 is an apocalyptic number.

31031012121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31031012121 is a deficient number, since it is larger than the sum of its proper divisors (11678338023).

31031012121 is a wasteful number, since it uses less digits than its factorization.

31031012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333666831.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31031012121 its reverse (12121013013), we get a palindrome (43152025134).

The spelling of 31031012121 in words is "thirty-one billion, thirty-one million, twelve thousand, one hundred twenty-one".