1121212121210 has 16 divisors (see below), whose sum is σ = 2018284221096. Its totient is φ = 448462092288.

The previous prime is 1121212121191. The next prime is 1121212121257. The reversal of 1121212121210 is 121212121211.

It can be written as a sum of positive squares in 4 ways, for example, as 952359340321 + 168852780889 = 975889^2 + 410917^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2636867 + ... + 3032406.

Almost surely, 2^{1121212121210} is an apocalyptic number.

1121212121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1121212121210 is a deficient number, since it is larger than the sum of its proper divisors (897072099886).

1121212121210 is a wasteful number, since it uses less digits than its factorization.

1121212121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689057.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1121212121210 its reverse (121212121211), we get a palindrome (1242424242421).

Subtracting from 1121212121210 its reverse (121212121211), we obtain a palindrome (999999999999).

The spelling of 1121212121210 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred ten".