21110333021221 has 2 divisors, whose sum is σ = 21110333021222. Its totient is φ = 21110333021220.

The previous prime is 21110333021161. The next prime is 21110333021233. The reversal of 21110333021221 is 12212033301112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15687540562500 + 5422792458721 = 3960750^2 + 2328689^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110333021221 - 2⁷ = 21110333021093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110333021192 and 21110333021201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110333021021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555166510610 + 10555166510611.

It is an arithmetic number, because the mean of its divisors is an integer number (10555166510611).

Almost surely, 2^{21110333021221} is an apocalyptic number.

It is an amenable number.

21110333021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110333021221 is an equidigital number, since it uses as much as digits as its factorization.

21110333021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21110333021221 its reverse (12212033301112), we get a palindrome (33322366322333).

The spelling of 21110333021221 in words is "twenty-one trillion, one hundred ten billion, three hundred thirty-three million, twenty-one thousand, two hundred twenty-one".