121221102221 has 16 divisors (see below), whose sum is σ = 122805965568. Its totient is φ = 119646374400.

The previous prime is 121221102199. The next prime is 121221102251. The reversal of 121221102221 is 122201122121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221102221 is a prime.

It is a super-2 number, since 2×121221102221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121221102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221102251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29484956 + ... + 29489066.

It is an arithmetic number, because the mean of its divisors is an integer number (7675372848).

Almost surely, 2^121221102221 is an apocalyptic number.

It is an amenable number.

121221102221 is a deficient number, since it is larger than the sum of its proper divisors (1584863347).

121221102221 is a wasteful number, since it uses less digits than its factorization.

121221102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121221102221 its reverse (122201122121), we get a palindrome (243422224342).

The spelling of 121221102221 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, two hundred twenty-one".