200000202121021 has 4 divisors (see below), whose sum is σ = 200000514747132. Its totient is φ = 199999889494912.

The previous prime is 200000202121007. The next prime is 200000202121043. The reversal of 200000202121021 is 120121202000002.

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 194496884933796 + 5503317187225 = 13946214^2 + 2345915^2 .

It is a cyclic number.

It is not a de Polignac number, because 200000202121021 - 2⁷ = 200000202120893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200000202120992 and 200000202121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200000202128021) 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, 155351470 + ... + 156633583.

It is an arithmetic number, because the mean of its divisors is an integer number (50000128686783).

Almost surely, 2^{200000202121021} is an apocalyptic number.

It is an amenable number.

200000202121021 is a deficient number, since it is larger than the sum of its proper divisors (312626111).

200000202121021 is an equidigital number, since it uses as much as digits as its factorization.

200000202121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312626110.

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

Adding to 200000202121021 its reverse (120121202000002), we get a palindrome (320121404121023).

The spelling of 200000202121021 in words is "two hundred trillion, two hundred two million, one hundred twenty-one thousand, twenty-one".