121111212120102 has 24 divisors (see below), whose sum is σ = 269499724268736. Its totient is φ = 39279312038736.

The previous prime is 121111212120077. The next prime is 121111212120133. The reversal of 121111212120102 is 201021212111121.

It is a happy number.

121111212120102 is a `hidden beast` number, since 121 + 111 + 212 + 120 + 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 an unprimeable number.

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, 90924332758 + ... + 90924334089.

It is an arithmetic number, because the mean of its divisors is an integer number (11229155177864).

Almost surely, 2^{121111212120102} is an apocalyptic number.

121111212120102 is an abundant number, since it is smaller than the sum of its proper divisors (148388512148634).

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

121111212120102 is a wasteful number, since it uses less digits than its factorization.

121111212120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181848666892 (or 181848666889 counting only the distinct ones).

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

Adding to 121111212120102 its reverse (201021212111121), we get a palindrome (322132424231223).

The spelling of 121111212120102 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty thousand, one hundred two".