121221202020102 has 96 divisors (see below), whose sum is σ = 275533690303872. Its totient is φ = 38471515875072.

The previous prime is 121221202020049. The next prime is 121221202020167. The reversal of 121221202020102 is 201020202122121.

It is a happy number.

121221202020102 is a `hidden beast` number, since 121 + 221 + 20 + 202 + 0 + 102 = 666.

It is a super-2 number, since 2×121221202020102² (a number of 29 digits) contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 173596768 + ... + 174293660.

It is an arithmetic number, because the mean of its divisors is an integer number (2870142607332).

Almost surely, 2^{121221202020102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121221202020102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137766845151936).

121221202020102 is an abundant number, since it is smaller than the sum of its proper divisors (154312488283770).

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

121221202020102 is a wasteful number, since it uses less digits than its factorization.

121221202020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702542 (or 702539 counting only the distinct ones).

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

Adding to 121221202020102 its reverse (201020202122121), we get a palindrome (322241404142223).

The spelling of 121221202020102 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, twenty thousand, one hundred two".