121221202102 has 64 divisors (see below), whose sum is σ = 244425484800. Its totient is φ = 43544666880.

The previous prime is 121221202097. The next prime is 121221202103. The reversal of 121221202102 is 201202122121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221202103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1684474 + ... + 1754962.

It is an arithmetic number, because the mean of its divisors is an integer number (3819148200).

Almost surely, 2^121221202102 is an apocalyptic number.

121221202102 is an abundant number, since it is smaller than the sum of its proper divisors (123204282698).

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

121221202102 is a wasteful number, since it uses less digits than its factorization.

121221202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71381.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121221202102 its reverse (201202122121), we get a palindrome (322423324223).

It can be divided in two parts, 121221 and 202102, that added together give a palindrome (323323).

The spelling of 121221202102 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred two".