21320444201 has 4 divisors (see below), whose sum is σ = 24366221952. Its totient is φ = 18274666452.

The previous prime is 21320444191. The next prime is 21320444203. The reversal of 21320444201 is 10244402312.

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 21320444201 - 2¹⁸ = 21320182057 is a prime.

It is a super-2 number, since 2×21320444201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320444203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522888865 + ... + 1522888878.

It is an arithmetic number, because the mean of its divisors is an integer number (6091555488).

Almost surely, 2^21320444201 is an apocalyptic number.

It is an amenable number.

21320444201 is a deficient number, since it is larger than the sum of its proper divisors (3045777751).

21320444201 is an equidigital number, since it uses as much as digits as its factorization.

21320444201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045777750.

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

Adding to 21320444201 its reverse (10244402312), we get a palindrome (31564846513).

The spelling of 21320444201 in words is "twenty-one billion, three hundred twenty million, four hundred forty-four thousand, two hundred one".