21101100127 has 2 divisors, whose sum is σ = 21101100128. Its totient is φ = 21101100126.

The previous prime is 21101100109. The next prime is 21101100149. The reversal of 21101100127 is 72100110112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101100127 is a prime.

It is a super-2 number, since 2×21101100127² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21101100127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101100187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550550063 + 10550550064.

It is an arithmetic number, because the mean of its divisors is an integer number (10550550064).

Almost surely, 2^21101100127 is an apocalyptic number.

21101100127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101100127 is an equidigital number, since it uses as much as digits as its factorization.

21101100127 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 16.

Adding to 21101100127 its reverse (72100110112), we get a palindrome (93201210239).

The spelling of 21101100127 in words is "twenty-one billion, one hundred one million, one hundred thousand, one hundred twenty-seven".