12121111010 has 16 divisors (see below), whose sum is σ = 23101411896. Its totient is φ = 4563241728.

The previous prime is 12121111007. The next prime is 12121111019. The reversal of 12121111010 is 1011112121.

It can be written as a sum of positive squares in 4 ways, for example, as 9934706929 + 2186404081 = 99673^2 + 46759^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12121110982 and 12121111000.

It is not an unprimeable number, because it can be changed into a prime (12121111019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35650157 + ... + 35650496.

Almost surely, 2^12121111010 is an apocalyptic number.

12121111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12121111010 is a deficient number, since it is larger than the sum of its proper divisors (10980300886).

12121111010 is a wasteful number, since it uses less digits than its factorization.

12121111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71300677.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12121111010 its reverse (1011112121), we get a palindrome (13132223131).

It can be divided in two parts, 1212111 and 1010, that added together give a palindrome (1213121).

The spelling of 12121111010 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, ten".