121112212021110 has 192 divisors, whose sum is σ = 326800225028160. Its totient is φ = 31099617669120.

The previous prime is 121112212021039. The next prime is 121112212021117. The reversal of 121112212021110 is 11120212211121.

It is a happy number.

121112212021110 is a `hidden beast` number, since 1 + 211 + 1 + 221 + 20 + 211 + 1 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112212021117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 173293570 + ... + 173991050.

It is an arithmetic number, because the mean of its divisors is an integer number (1702084505355).

Almost surely, 2^{121112212021110} is an apocalyptic number.

121112212021110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121112212021110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163400112514080).

121112212021110 is an abundant number, since it is smaller than the sum of its proper divisors (205688013007050).

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

121112212021110 is a wasteful number, since it uses less digits than its factorization.

121112212021110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698223 (or 698220 counting only the distinct ones).

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

Adding to 121112212021110 its reverse (11120212211121), we get a palindrome (132232424232231).

The spelling of 121112212021110 in words is "one hundred twenty-one trillion, one hundred twelve billion, two hundred twelve million, twenty-one thousand, one hundred ten".