200120012200021 has 4 divisors (see below), whose sum is σ = 200121379389100. Its totient is φ = 200118645010944.

The previous prime is 200120012200013. The next prime is 200120012200039. The reversal of 200120012200021 is 120002210021002.

It is a happy number.

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 117767835663921 + 82352176536100 = 10852089^2 + 9074810^2 .

It is a cyclic number.

It is not a de Polignac number, because 200120012200021 - 2³ = 200120012200013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200120012199974 and 200120012200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200120012200081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683374956 + ... + 683667733.

It is an arithmetic number, because the mean of its divisors is an integer number (50030344847275).

Almost surely, 2^{200120012200021} is an apocalyptic number.

It is an amenable number.

200120012200021 is a deficient number, since it is larger than the sum of its proper divisors (1367189079).

200120012200021 is a wasteful number, since it uses less digits than its factorization.

200120012200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367189078.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 200120012200021 its reverse (120002210021002), we get a palindrome (320122222221023).

The spelling of 200120012200021 in words is "two hundred trillion, one hundred twenty billion, twelve million, two hundred thousand, twenty-one".