21221044441351 has 2 divisors, whose sum is σ = 21221044441352. Its totient is φ = 21221044441350.

The previous prime is 21221044441273. The next prime is 21221044441417. The reversal of 21221044441351 is 15314444012212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221044441351 - 2¹¹ = 21221044439303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221044451351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610522220675 + 10610522220676.

It is an arithmetic number, because the mean of its divisors is an integer number (10610522220676).

Almost surely, 2^{21221044441351} is an apocalyptic number.

21221044441351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221044441351 is an equidigital number, since it uses as much as digits as its factorization.

21221044441351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 34.

Adding to 21221044441351 its reverse (15314444012212), we get a palindrome (36535488453563).

The spelling of 21221044441351 in words is "twenty-one trillion, two hundred twenty-one billion, forty-four million, four hundred forty-one thousand, three hundred fifty-one".