121100200021 has 2 divisors, whose sum is σ = 121100200022. Its totient is φ = 121100200020.

The previous prime is 121100200019. The next prime is 121100200061. The reversal of 121100200021 is 120002001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118397239921 + 2702960100 = 344089^2 + 51990^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100200021 - 2¹ = 121100200019 is a prime.

Together with 121100200019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121100199980 and 121100200007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121100200061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550100010 + 60550100011.

It is an arithmetic number, because the mean of its divisors is an integer number (60550100011).

Almost surely, 2^121100200021 is an apocalyptic number.

It is an amenable number.

121100200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100200021 is an equidigital number, since it uses as much as digits as its factorization.

121100200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121100200021 its reverse (120002001121), we get a palindrome (241102201142).

The spelling of 121100200021 in words is "one hundred twenty-one billion, one hundred million, two hundred thousand, twenty-one".