202320023021 has 4 divisors (see below), whose sum is σ = 203347028412. Its totient is φ = 201293017632.

The previous prime is 202320023011. The next prime is 202320023023. The reversal of 202320023021 is 120320023202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120320023202 = 2 ⋅60160011601.

It can be written as a sum of positive squares in 2 ways, for example, as 177905960521 + 24414062500 = 421789^2 + 156250^2 .

It is a cyclic number.

It is not a de Polignac number, because 202320023021 - 2¹⁰ = 202320021997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202320023023) 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, 513502400 + ... + 513502793.

It is an arithmetic number, because the mean of its divisors is an integer number (50836757103).

Almost surely, 2^202320023021 is an apocalyptic number.

It is an amenable number.

202320023021 is a deficient number, since it is larger than the sum of its proper divisors (1027005391).

202320023021 is a wasteful number, since it uses less digits than its factorization.

202320023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027005390.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 202320023021 its reverse (120320023202), we get a palindrome (322640046223).

The spelling of 202320023021 in words is "two hundred two billion, three hundred twenty million, twenty-three thousand, twenty-one".