121220002122221 has 16 divisors (see below), whose sum is σ = 123056699033088. Its totient is φ = 119388160252800.

The previous prime is 121220002122203. The next prime is 121220002122253. The reversal of 121220002122221 is 122221200022121.

It is a cyclic number.

It is not a de Polignac number, because 121220002122221 - 2²⁶ = 121219935013357 is a prime.

It is a super-2 number, since 2×121220002122221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220002122193 and 121220002122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220002122421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185901260 + ... + 186552186.

It is an arithmetic number, because the mean of its divisors is an integer number (7691043689568).

Almost surely, 2^{121220002122221} is an apocalyptic number.

It is an amenable number.

121220002122221 is a deficient number, since it is larger than the sum of its proper divisors (1836696910867).

121220002122221 is an equidigital number, since it uses as much as digits as its factorization.

121220002122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654652.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121220002122221 its reverse (122221200022121), we get a palindrome (243441202144342).

The spelling of 121220002122221 in words is "one hundred twenty-one trillion, two hundred twenty billion, two million, one hundred twenty-two thousand, two hundred twenty-one".