202043021 has 4 divisors (see below), whose sum is σ = 202328700. Its totient is φ = 201757344.

The previous prime is 202042993. The next prime is 202043059. The reversal of 202043021 is 120340202.

202043021 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 67158025 + 134884996 = 8195^2 + 11614^2 .

It is a cyclic number.

It is not a de Polignac number, because 202043021 - 2¹⁸ = 201780877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202042987 and 202043005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202043221) 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, 141776 + ... + 143193.

It is an arithmetic number, because the mean of its divisors is an integer number (50582175).

Almost surely, 2^202043021 is an apocalyptic number.

It is an amenable number.

202043021 is a deficient number, since it is larger than the sum of its proper divisors (285679).

202043021 is an equidigital number, since it uses as much as digits as its factorization.

202043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285678.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 202043021 is about 14214.1837964760. The cubic root of 202043021 is about 586.7880820430.

Adding to 202043021 its reverse (120340202), we get a palindrome (322383223).

The spelling of 202043021 in words is "two hundred two million, forty-three thousand, twenty-one".