201323423021 has 4 divisors (see below), whose sum is σ = 230083912032. Its totient is φ = 172562934012.

The previous prime is 201323423017. The next prime is 201323423143. The reversal of 201323423021 is 120324323102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 201323423021 - 2² = 201323423017 is a prime.

It is a super-2 number, since 2×201323423021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201323423221) 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, 14380244495 + ... + 14380244508.

It is an arithmetic number, because the mean of its divisors is an integer number (57520978008).

Almost surely, 2^201323423021 is an apocalyptic number.

It is an amenable number.

201323423021 is a deficient number, since it is larger than the sum of its proper divisors (28760489011).

201323423021 is an equidigital number, since it uses as much as digits as its factorization.

201323423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28760489010.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 201323423021 its reverse (120324323102), we get a palindrome (321647746123).

The spelling of 201323423021 in words is "two hundred one billion, three hundred twenty-three million, four hundred twenty-three thousand, twenty-one".