201324440021 has 4 divisors (see below), whose sum is σ = 211920463200. Its totient is φ = 190728416844.

The previous prime is 201324439961. The next prime is 201324440047. The reversal of 201324440021 is 120044423102.

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 a cyclic number.

It is not a de Polignac number, because 201324440021 - 2⁶ = 201324439957 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 (201324440081) 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, 5298011561 + ... + 5298011598.

It is an arithmetic number, because the mean of its divisors is an integer number (52980115800).

Almost surely, 2^201324440021 is an apocalyptic number.

It is an amenable number.

201324440021 is a deficient number, since it is larger than the sum of its proper divisors (10596023179).

201324440021 is a wasteful number, since it uses less digits than its factorization.

201324440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10596023178.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 201324440021 its reverse (120044423102), we get a palindrome (321368863123).

The spelling of 201324440021 in words is "two hundred one billion, three hundred twenty-four million, four hundred forty thousand, twenty-one".