20233120210021 has 4 divisors (see below), whose sum is σ = 20266785968044. Its totient is φ = 20199454452000.

The previous prime is 20233120210019. The next prime is 20233120210049. The reversal of 20233120210021 is 12001202133202.

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 17965611279396 + 2267508930625 = 4238586^2 + 1505825^2 .

It is a cyclic number.

It is not a de Polignac number, because 20233120210021 - 2¹ = 20233120210019 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 (20233120211021) 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, 16832878110 + ... + 16832879311.

It is an arithmetic number, because the mean of its divisors is an integer number (5066696492011).

Almost surely, 2^{20233120210021} is an apocalyptic number.

It is an amenable number.

20233120210021 is a deficient number, since it is larger than the sum of its proper divisors (33665758023).

20233120210021 is an equidigital number, since it uses as much as digits as its factorization.

20233120210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33665758022.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20233120210021 its reverse (12001202133202), we get a palindrome (32234322343223).

The spelling of 20233120210021 in words is "twenty trillion, two hundred thirty-three billion, one hundred twenty million, two hundred ten thousand, twenty-one".