12121111210 has 64 divisors (see below), whose sum is σ = 23720939424. Its totient is φ = 4432896000.

The previous prime is 12121111207. The next prime is 12121111243. The reversal of 12121111210 is 1211112121.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 1246584249 + 10874526961 = 35307^2 + 104281^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 8183670 + ... + 8185150.

Almost surely, 2^12121111210 is an apocalyptic number.

12121111210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12121111210 is a deficient number, since it is larger than the sum of its proper divisors (11599828214).

12121111210 is a wasteful number, since it uses less digits than its factorization.

12121111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12121111210 its reverse (1211112121), we get a palindrome (13332223331).

The spelling of 12121111210 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, two hundred ten".