121002200000021 has 2 divisors, whose sum is σ = 121002200000022. Its totient is φ = 121002200000020.

The previous prime is 121002199999987. The next prime is 121002200000023. The reversal of 121002200000021 is 120000002200121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85065831856996 + 35936368143025 = 9223114^2 + 5994695^2 .

It is a cyclic number.

It is not a de Polignac number, because 121002200000021 - 2¹⁰ = 121002199998997 is a prime.

Together with 121002200000023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121002199999948 and 121002200000011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121002200000023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60501100000010 + 60501100000011.

It is an arithmetic number, because the mean of its divisors is an integer number (60501100000011).

Almost surely, 2^{121002200000021} is an apocalyptic number.

It is an amenable number.

121002200000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121002200000021 is an equidigital number, since it uses as much as digits as its factorization.

121002200000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121002200000021 its reverse (120000002200121), we get a palindrome (241002202200142).

The spelling of 121002200000021 in words is "one hundred twenty-one trillion, two billion, two hundred million, twenty-one", and thus it is an aban number.