21111021201271 has 2 divisors, whose sum is σ = 21111021201272. Its totient is φ = 21111021201270.

The previous prime is 21111021201181. The next prime is 21111021201287. The reversal of 21111021201271 is 17210212011112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111021201271 - 2¹³ = 21111021193079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111021201671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555510600635 + 10555510600636.

It is an arithmetic number, because the mean of its divisors is an integer number (10555510600636).

Almost surely, 2^{21111021201271} is an apocalyptic number.

21111021201271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111021201271 is an equidigital number, since it uses as much as digits as its factorization.

21111021201271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 22.

Adding to 21111021201271 its reverse (17210212011112), we get a palindrome (38321233212383).

The spelling of 21111021201271 in words is "twenty-one trillion, one hundred eleven billion, twenty-one million, two hundred one thousand, two hundred seventy-one".