21321110203147 has 2 divisors, whose sum is σ = 21321110203148. Its totient is φ = 21321110203146.

The previous prime is 21321110203109. The next prime is 21321110203163. The reversal of 21321110203147 is 74130201112312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321110203147 - 2¹⁵ = 21321110170379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321110203747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660555101573 + 10660555101574.

It is an arithmetic number, because the mean of its divisors is an integer number (10660555101574).

Almost surely, 2^{21321110203147} is an apocalyptic number.

21321110203147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321110203147 is an equidigital number, since it uses as much as digits as its factorization.

21321110203147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 21321110203147 its reverse (74130201112312), we get a palindrome (95451311315459).

The spelling of 21321110203147 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred ten million, two hundred three thousand, one hundred forty-seven".