200785972021 has 4 divisors (see below), whose sum is σ = 202773952044. Its totient is φ = 198797992000.

The previous prime is 200785972001. The next prime is 200785972043. The reversal of 200785972021 is 120279587002.

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 193169919121 + 7616052900 = 439511^2 + 87270^2 .

It is a cyclic number.

It is not a de Polignac number, because 200785972021 - 2³⁵ = 166426233653 is a prime.

It is a super-3 number, since 3×200785972021³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200785972001) 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, 993989860 + ... + 993990061.

It is an arithmetic number, because the mean of its divisors is an integer number (50693488011).

Almost surely, 2^200785972021 is an apocalyptic number.

It is an amenable number.

200785972021 is a deficient number, since it is larger than the sum of its proper divisors (1987980023).

200785972021 is a wasteful number, since it uses less digits than its factorization.

200785972021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987980022.

The product of its (nonzero) digits is 141120, while the sum is 43.

The spelling of 200785972021 in words is "two hundred billion, seven hundred eighty-five million, nine hundred seventy-two thousand, twenty-one".