21234023201 has 4 divisors (see below), whose sum is σ = 21582122004. Its totient is φ = 20885924400.

The previous prime is 21234023149. The next prime is 21234023233. The reversal of 21234023201 is 10232043212.

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 5408131600 + 15825891601 = 73540^2 + 125801^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234023201 - 2¹⁰ = 21234022177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234020201) 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, 174049310 + ... + 174049431.

It is an arithmetic number, because the mean of its divisors is an integer number (5395530501).

Almost surely, 2^21234023201 is an apocalyptic number.

It is an amenable number.

21234023201 is a deficient number, since it is larger than the sum of its proper divisors (348098803).

21234023201 is an equidigital number, since it uses as much as digits as its factorization.

21234023201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348098802.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21234023201 its reverse (10232043212), we get a palindrome (31466066413).

The spelling of 21234023201 in words is "twenty-one billion, two hundred thirty-four million, twenty-three thousand, two hundred one".