21011101127 has 2 divisors, whose sum is σ = 21011101128. Its totient is φ = 21011101126.

The previous prime is 21011101103. The next prime is 21011101171. The reversal of 21011101127 is 72110111012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011101127 - 2⁸ = 21011100871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011101187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505550563 + 10505550564.

It is an arithmetic number, because the mean of its divisors is an integer number (10505550564).

Almost surely, 2^21011101127 is an apocalyptic number.

21011101127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011101127 is an equidigital number, since it uses as much as digits as its factorization.

21011101127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 17.

Adding to 21011101127 its reverse (72110111012), we get a palindrome (93121212139).

The spelling of 21011101127 in words is "twenty-one billion, eleven million, one hundred one thousand, one hundred twenty-seven".