22021210121221 has 8 divisors (see below), whose sum is σ = 22083003081944. Its totient is φ = 21959500723200.

The previous prime is 22021210121189. The next prime is 22021210121227. The reversal of 22021210121221 is 12212101212022.

It can be written as a sum of positive squares in 4 ways, for example, as 16184086473025 + 5837123648196 = 4022945^2 + 2416014^2 .

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 22021210121221 - 2⁵ = 22021210121189 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 (22021210121227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20362860 + ... + 21417013.

It is an arithmetic number, because the mean of its divisors is an integer number (2760375385243).

Almost surely, 2^{22021210121221} is an apocalyptic number.

It is an amenable number.

22021210121221 is a deficient number, since it is larger than the sum of its proper divisors (61792960723).

22021210121221 is an equidigital number, since it uses as much as digits as its factorization.

22021210121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41781351.

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

Adding to 22021210121221 its reverse (12212101212022), we get a palindrome (34233311333243).

The spelling of 22021210121221 in words is "twenty-two trillion, twenty-one billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".