200202202021 has 4 divisors (see below), whose sum is σ = 200301461452. Its totient is φ = 200102942592.

The previous prime is 200202202007. The next prime is 200202202033. The reversal of 200202202021 is 120202202002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120202202002 = 2 ⋅60101101001.

It can be written as a sum of positive squares in 2 ways, for example, as 88036824100 + 112165377921 = 296710^2 + 334911^2 .

It is a cyclic number.

It is not a de Polignac number, because 200202202021 - 2⁷ = 200202201893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200202201992 and 200202202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200202202001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49626690 + ... + 49630723.

It is an arithmetic number, because the mean of its divisors is an integer number (50075365363).

Almost surely, 2^200202202021 is an apocalyptic number.

It is an amenable number.

200202202021 is a deficient number, since it is larger than the sum of its proper divisors (99259431).

200202202021 is an equidigital number, since it uses as much as digits as its factorization.

200202202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99259430.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 200202202021 its reverse (120202202002), we get a palindrome (320404404023).

The spelling of 200202202021 in words is "two hundred billion, two hundred two million, two hundred two thousand, twenty-one".