12312121000 has 64 divisors (see below), whose sum is σ = 29240527680. Its totient is φ = 4851316800.

The previous prime is 12312120979. The next prime is 12312121001. The reversal of 12312121000 is 12121321.

It is not an unprimeable number, because it can be changed into a prime (12312121001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24882 + ... + 158881.

It is an arithmetic number, because the mean of its divisors is an integer number (456883245).

Almost surely, 2^12312121000 is an apocalyptic number.

12312121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12312121000 is an abundant number, since it is smaller than the sum of its proper divisors (16928406680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12312121000 is a wasteful number, since it uses less digits than its factorization.

12312121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183851 (or 183837 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12312121000 its reverse (12121321), we get a palindrome (12324242321).

The spelling of 12312121000 in words is "twelve billion, three hundred twelve million, one hundred twenty-one thousand".