21002011127 has 2 divisors, whose sum is σ = 21002011128. Its totient is φ = 21002011126.

The previous prime is 21002011073. The next prime is 21002011139. The reversal of 21002011127 is 72111020012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002011127 - 2⁸ = 21002010871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002011187) 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, 10501005563 + 10501005564.

It is an arithmetic number, because the mean of its divisors is an integer number (10501005564).

Almost surely, 2^21002011127 is an apocalyptic number.

21002011127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002011127 is an equidigital number, since it uses as much as digits as its factorization.

21002011127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 21002011127 its reverse (72111020012), we get a palindrome (93113031139).

The spelling of 21002011127 in words is "twenty-one billion, two million, eleven thousand, one hundred twenty-seven".