21011122120127 has 2 divisors, whose sum is σ = 21011122120128. Its totient is φ = 21011122120126.

The previous prime is 21011122120111. The next prime is 21011122120129. The reversal of 21011122120127 is 72102122111012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011122120127 - 2⁴ = 21011122120111 is a prime.

It is a super-2 number, since 2×21011122120127² (a number of 27 digits) contains 22 as substring.

Together with 21011122120129, 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 (21011122120129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505561060063 + 10505561060064.

It is an arithmetic number, because the mean of its divisors is an integer number (10505561060064).

Almost surely, 2^{21011122120127} is an apocalyptic number.

21011122120127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011122120127 is an equidigital number, since it uses as much as digits as its factorization.

21011122120127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 21011122120127 its reverse (72102122111012), we get a palindrome (93113244231139).

The spelling of 21011122120127 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, one hundred twenty thousand, one hundred twenty-seven".