21011001127 has 2 divisors, whose sum is σ = 21011001128. Its totient is φ = 21011001126.

The previous prime is 21011001083. The next prime is 21011001197. The reversal of 21011001127 is 72110011012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011001127 - 2¹⁵ = 21010968359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21011001127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011001197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505500563 + 10505500564.

It is an arithmetic number, because the mean of its divisors is an integer number (10505500564).

Almost surely, 2^21011001127 is an apocalyptic number.

21011001127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011001127 is an equidigital number, since it uses as much as digits as its factorization.

21011001127 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 21011001127 its reverse (72110011012), we get a palindrome (93121012139).

The spelling of 21011001127 in words is "twenty-one billion, eleven million, one thousand, one hundred twenty-seven".