21022144233221 has 8 divisors (see below), whose sum is σ = 21261735371160. Its totient is φ = 20782628368128.

The previous prime is 21022144233197. The next prime is 21022144233227. The reversal of 21022144233221 is 12233244122012.

It can be written as a sum of positive squares in 4 ways, for example, as 525146608900 + 20496997624321 = 724670^2 + 4527361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21022144233221 - 2¹⁴ = 21022144216837 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 (21022144233227) 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 7 ways as a sum of consecutive naturals, for example, 18256376 + ... + 19373681.

It is an arithmetic number, because the mean of its divisors is an integer number (2657716921395).

Almost surely, 2^{21022144233221} is an apocalyptic number.

It is an amenable number.

21022144233221 is a deficient number, since it is larger than the sum of its proper divisors (239591137939).

21022144233221 is an equidigital number, since it uses as much as digits as its factorization.

21022144233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37636423.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21022144233221 its reverse (12233244122012), we get a palindrome (33255388355233).

The spelling of 21022144233221 in words is "twenty-one trillion, twenty-two billion, one hundred forty-four million, two hundred thirty-three thousand, two hundred twenty-one".