11112122121210 has 144 divisors (see below), whose sum is σ = 32531349188520. Its totient is φ = 2628144076800.

The previous prime is 11112122121209. The next prime is 11112122121257. The reversal of 11112122121210 is 1212122121111.

It is a happy number.

11112122121210 is a `hidden beast` number, since 111 + 121 + 221 + 2 + 1 + 210 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2819951091441 + 8292171029769 = 1679271^2 + 2879613^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11997375 + ... + 12890354.

Almost surely, 2^{11112122121210} is an apocalyptic number.

11112122121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11112122121210 is an abundant number, since it is smaller than the sum of its proper divisors (21419227067310).

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

11112122121210 is a wasteful number, since it uses less digits than its factorization.

11112122121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24887805 (or 24887791 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11112122121210 its reverse (1212122121111), we get a palindrome (12324244242321).

Subtracting from 11112122121210 its reverse (1212122121111), we obtain a palindrome (9900000000099).

The spelling of 11112122121210 in words is "eleven trillion, one hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred ten".