121221222102 has 24 divisors (see below), whose sum is σ = 269744522736. Its totient is φ = 39314990736.

The previous prime is 121221222079. The next prime is 121221222113. The reversal of 121221222102 is 201222122121.

It is a happy number.

121221222102 is a `hidden beast` number, since 121 + 221 + 222 + 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 (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91006258 + ... + 91007589.

It is an arithmetic number, because the mean of its divisors is an integer number (11239355114).

Almost surely, 2^121221222102 is an apocalyptic number.

121221222102 is an abundant number, since it is smaller than the sum of its proper divisors (148523300634).

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

121221222102 is a wasteful number, since it uses less digits than its factorization.

121221222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182013892 (or 182013889 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121221222102 its reverse (201222122121), we get a palindrome (322443344223).

The spelling of 121221222102 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred two".