121221210111102 has 24 divisors (see below), whose sum is σ = 276469426569960. Its totient is φ = 38280382140240.

The previous prime is 121221210111091. The next prime is 121221210111107. The reversal of 121221210111102 is 201111012122121.

It is a happy number.

121221210111102 is a `hidden beast` number, since 1 + 21 + 221 + 210 + 111 + 102 = 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 (121221210111107) 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 11 ways as a sum of consecutive naturals, for example, 177223991049 + ... + 177223991732.

It is an arithmetic number, because the mean of its divisors is an integer number (11519559440415).

Almost surely, 2^{121221210111102} is an apocalyptic number.

121221210111102 is an abundant number, since it is smaller than the sum of its proper divisors (155248216458858).

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

121221210111102 is a wasteful number, since it uses less digits than its factorization.

121221210111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354447982808 (or 354447982805 counting only the distinct ones).

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

Adding to 121221210111102 its reverse (201111012122121), we get a palindrome (322332222233223).

The spelling of 121221210111102 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred ten million, one hundred eleven thousand, one hundred two".