21221231112201 has 4 divisors (see below), whose sum is σ = 28294974816272. Its totient is φ = 14147487408132.

The previous prime is 21221231112131. The next prime is 21221231112251. The reversal of 21221231112201 is 10221113212212.

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 21221231112201 - 2¹⁰ = 21221231111177 is a prime.

It is a super-3 number, since 3×21221231112201³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221231112251) 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, 3536871852031 + ... + 3536871852036.

It is an arithmetic number, because the mean of its divisors is an integer number (7073743704068).

Almost surely, 2^{21221231112201} is an apocalyptic number.

It is an amenable number.

21221231112201 is a deficient number, since it is larger than the sum of its proper divisors (7073743704071).

21221231112201 is an equidigital number, since it uses as much as digits as its factorization.

21221231112201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073743704070.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21221231112201 its reverse (10221113212212), we get a palindrome (31442344324413).

The spelling of 21221231112201 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred thirty-one million, one hundred twelve thousand, two hundred one".