21112202210221 has 4 divisors (see below), whose sum is σ = 22030124045472. Its totient is φ = 20194280374972.

The previous prime is 21112202210191. The next prime is 21112202210257. The reversal of 21112202210221 is 12201220221112.

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 21112202210221 - 2⁵ = 21112202210189 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 (21112202210261) 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, 458960917591 + ... + 458960917636.

It is an arithmetic number, because the mean of its divisors is an integer number (5507531011368).

Almost surely, 2^{21112202210221} is an apocalyptic number.

It is an amenable number.

21112202210221 is a deficient number, since it is larger than the sum of its proper divisors (917921835251).

21112202210221 is an equidigital number, since it uses as much as digits as its factorization.

21112202210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917921835250.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21112202210221 its reverse (12201220221112), we get a palindrome (33313422431333).

The spelling of 21112202210221 in words is "twenty-one trillion, one hundred twelve billion, two hundred two million, two hundred ten thousand, two hundred twenty-one".