200122100021 has 4 divisors (see below), whose sum is σ = 201958082700. Its totient is φ = 198286117344.

The previous prime is 200122100011. The next prime is 200122100023. The reversal of 200122100021 is 120001221002.

It is a happy number.

200122100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178780980625 + 21341119396 = 422825^2 + 146086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200122100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200122099975 and 200122100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200122100023) 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 3 ways as a sum of consecutive naturals, for example, 917991176 + ... + 917991393.

It is an arithmetic number, because the mean of its divisors is an integer number (50489520675).

Almost surely, 2^200122100021 is an apocalyptic number.

It is an amenable number.

200122100021 is a deficient number, since it is larger than the sum of its proper divisors (1835982679).

200122100021 is a wasteful number, since it uses less digits than its factorization.

200122100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835982678.

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

Adding to 200122100021 its reverse (120001221002), we get a palindrome (320123321023).

The spelling of 200122100021 in words is "two hundred billion, one hundred twenty-two million, one hundred thousand, twenty-one".