21211200220127 has 2 divisors, whose sum is σ = 21211200220128. Its totient is φ = 21211200220126.

The previous prime is 21211200220087. The next prime is 21211200220139. The reversal of 21211200220127 is 72102200211212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211200220127 - 2¹⁰ = 21211200219103 is a prime.

It is a super-2 number, since 2×21211200220127² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211200223127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605600110063 + 10605600110064.

It is an arithmetic number, because the mean of its divisors is an integer number (10605600110064).

Almost surely, 2^{21211200220127} is an apocalyptic number.

21211200220127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211200220127 is an equidigital number, since it uses as much as digits as its factorization.

21211200220127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21211200220127 its reverse (72102200211212), we get a palindrome (93313400431339).

The spelling of 21211200220127 in words is "twenty-one trillion, two hundred eleven billion, two hundred million, two hundred twenty thousand, one hundred twenty-seven".