121000012221221 has 16 divisors (see below), whose sum is σ = 138336337555200. Its totient is φ = 103676342085888.

The previous prime is 121000012221161. The next prime is 121000012221229. The reversal of 121000012221221 is 122122210000121.

It is a cyclic number.

It is not a de Polignac number, because 121000012221221 - 2²² = 121000008026917 is a prime.

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 121000012221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000012221229) 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, 577077920 + ... + 577287558.

It is an arithmetic number, because the mean of its divisors is an integer number (8646021097200).

Almost surely, 2^{121000012221221} is an apocalyptic number.

It is an amenable number.

121000012221221 is a deficient number, since it is larger than the sum of its proper divisors (17336325333979).

121000012221221 is a wasteful number, since it uses less digits than its factorization.

121000012221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239428.

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

Adding to 121000012221221 its reverse (122122210000121), we get a palindrome (243122222221342).

The spelling of 121000012221221 in words is "one hundred twenty-one trillion, twelve million, two hundred twenty-one thousand, two hundred twenty-one".