12312121210 has 16 divisors (see below), whose sum is σ = 22163580936. Its totient is φ = 4924456768.

The previous prime is 12312121193. The next prime is 12312121253. The reversal of 12312121210 is 1212121321.

It can be written as a sum of positive squares in 4 ways, for example, as 5425942921 + 6886178289 = 73661^2 + 82983^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106572 + ... + 189688.

Almost surely, 2^12312121210 is an apocalyptic number.

12312121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12312121210 is a deficient number, since it is larger than the sum of its proper divisors (9851459726).

12312121210 is a wasteful number, since it uses less digits than its factorization.

12312121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97937.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12312121210 its reverse (1212121321), we get a palindrome (13524242531).

The spelling of 12312121210 in words is "twelve billion, three hundred twelve million, one hundred twenty-one thousand, two hundred ten".