121000200200021 has 8 divisors (see below), whose sum is σ = 121354332447000. Its totient is φ = 120646352286720.

The previous prime is 121000200200017. The next prime is 121000200200023. The reversal of 121000200200021 is 120002002000121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 56318570884900 + 64681629315121 = 7504570^2 + 8042489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121000200200021 - 2² = 121000200200017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121000200199975 and 121000200200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000200200023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70231046 + ... + 71933303.

It is an arithmetic number, because the mean of its divisors is an integer number (15169291555875).

Almost surely, 2^{121000200200021} is an apocalyptic number.

It is an amenable number.

121000200200021 is a deficient number, since it is larger than the sum of its proper divisors (354132246979).

121000200200021 is a wasteful number, since it uses less digits than its factorization.

121000200200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142166839.

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

Adding to 121000200200021 its reverse (120002002000121), we get a palindrome (241002202200142).

The spelling of 121000200200021 in words is "one hundred twenty-one trillion, two hundred million, two hundred thousand, twenty-one".