202023022021 has 4 divisors (see below), whose sum is σ = 206950412844. Its totient is φ = 197095631200.

The previous prime is 202023022001. The next prime is 202023022051. The reversal of 202023022021 is 120220320202.

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 66414959521 + 135608062500 = 257711^2 + 368250^2 .

It is a cyclic number.

It is not a de Polignac number, because 202023022021 - 2⁹ = 202023021509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202023021986 and 202023022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202023022001) 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, 2463695350 + ... + 2463695431.

It is an arithmetic number, because the mean of its divisors is an integer number (51737603211).

Almost surely, 2^202023022021 is an apocalyptic number.

It is an amenable number.

202023022021 is a deficient number, since it is larger than the sum of its proper divisors (4927390823).

202023022021 is an equidigital number, since it uses as much as digits as its factorization.

202023022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927390822.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 202023022021 its reverse (120220320202), we get a palindrome (322243342223).

The spelling of 202023022021 in words is "two hundred two billion, twenty-three million, twenty-two thousand, twenty-one".