21222121221201 has 4 divisors (see below), whose sum is σ = 28296161628272. Its totient is φ = 14148080814132.

The previous prime is 21222121221199. The next prime is 21222121221227. The reversal of 21222121221201 is 10212212122212.

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 21222121221201 - 2¹ = 21222121221199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222121201201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3537020203531 + ... + 3537020203536.

It is an arithmetic number, because the mean of its divisors is an integer number (7074040407068).

Almost surely, 2^{21222121221201} is an apocalyptic number.

It is an amenable number.

21222121221201 is a deficient number, since it is larger than the sum of its proper divisors (7074040407071).

21222121221201 is an equidigital number, since it uses as much as digits as its factorization.

21222121221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7074040407070.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222121221201 its reverse (10212212122212), we get a palindrome (31434333343413).

The spelling of 21222121221201 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred one".