21221400412271 has 2 divisors, whose sum is σ = 21221400412272. Its totient is φ = 21221400412270.

The previous prime is 21221400412181. The next prime is 21221400412273. The reversal of 21221400412271 is 17221400412212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221400412271 - 2¹⁸ = 21221400150127 is a prime.

Together with 21221400412273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221400412273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610700206135 + 10610700206136.

It is an arithmetic number, because the mean of its divisors is an integer number (10610700206136).

Almost surely, 2^{21221400412271} is an apocalyptic number.

21221400412271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221400412271 is an equidigital number, since it uses as much as digits as its factorization.

21221400412271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 29.

Adding to 21221400412271 its reverse (17221400412212), we get a palindrome (38442800824483).

The spelling of 21221400412271 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred million, four hundred twelve thousand, two hundred seventy-one".