21020323201 has 4 divisors (see below), whose sum is σ = 21024861012. Its totient is φ = 21015785392.

The previous prime is 21020323153. The next prime is 21020323229. The reversal of 21020323201 is 10232302012.

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 1469572225 + 19550750976 = 38335^2 + 139824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020323201 - 2⁷ = 21020323073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020323241) 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, 2261950 + ... + 2271223.

It is an arithmetic number, because the mean of its divisors is an integer number (5256215253).

Almost surely, 2^21020323201 is an apocalyptic number.

It is an amenable number.

21020323201 is a deficient number, since it is larger than the sum of its proper divisors (4537811).

21020323201 is an equidigital number, since it uses as much as digits as its factorization.

21020323201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4537810.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21020323201 its reverse (10232302012), we get a palindrome (31252625213).

The spelling of 21020323201 in words is "twenty-one billion, twenty million, three hundred twenty-three thousand, two hundred one".