200121200021 has 8 divisors (see below), whose sum is σ = 202962973824. Its totient is φ = 197280069840.

The previous prime is 200121200017. The next prime is 200121200051. The reversal of 200121200021 is 120002121002.

It is a happy number.

200121200021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 200121200021 - 2² = 200121200017 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 = 200121199975 and 200121200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121200051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483560 + ... + 796286.

It is an arithmetic number, because the mean of its divisors is an integer number (25370371728).

Almost surely, 2^200121200021 is an apocalyptic number.

It is an amenable number.

200121200021 is a deficient number, since it is larger than the sum of its proper divisors (2841773803).

200121200021 is an equidigital number, since it uses as much as digits as its factorization.

200121200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321811.

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

Adding to 200121200021 its reverse (120002121002), we get a palindrome (320123321023).

The spelling of 200121200021 in words is "two hundred billion, one hundred twenty-one million, two hundred thousand, twenty-one".