121221002121 has 16 divisors (see below), whose sum is σ = 162830236224. Its totient is φ = 80213048064.

The previous prime is 121221002113. The next prime is 121221002131. The reversal of 121221002121 is 121200122121.

It is not a de Polignac number, because 121221002121 - 2³ = 121221002113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121221002121.

It is not an unprimeable number, because it can be changed into a prime (121221002131) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3861330 + ... + 3892596.

It is an arithmetic number, because the mean of its divisors is an integer number (10176889764).

Almost surely, 2^121221002121 is an apocalyptic number.

It is an amenable number.

121221002121 is a deficient number, since it is larger than the sum of its proper divisors (41609234103).

121221002121 is a wasteful number, since it uses less digits than its factorization.

121221002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40840.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121221002121 its reverse (121200122121), we get a palindrome (242421124242).

The spelling of 121221002121 in words is "one hundred twenty-one billion, two hundred twenty-one million, two thousand, one hundred twenty-one".