21231322201 has 4 divisors (see below), whose sum is σ = 21231639504. Its totient is φ = 21231004900.

The previous prime is 21231322193. The next prime is 21231322213. The reversal of 21231322201 is 10222313212.

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 21231322201 - 2³ = 21231322193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231322291) 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, 14815 + ... + 206596.

It is an arithmetic number, because the mean of its divisors is an integer number (5307909876).

Almost surely, 2^21231322201 is an apocalyptic number.

It is an amenable number.

21231322201 is a deficient number, since it is larger than the sum of its proper divisors (317303).

21231322201 is an equidigital number, since it uses as much as digits as its factorization.

21231322201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317302.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21231322201 its reverse (10222313212), we get a palindrome (31453635413).

The spelling of 21231322201 in words is "twenty-one billion, two hundred thirty-one million, three hundred twenty-two thousand, two hundred one".