21211102127 has 2 divisors, whose sum is σ = 21211102128. Its totient is φ = 21211102126.

The previous prime is 21211102091. The next prime is 21211102141. The reversal of 21211102127 is 72120111212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211102127 - 2²⁰ = 21210053551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211102099 and 21211102108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211102027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605551063 + 10605551064.

It is an arithmetic number, because the mean of its divisors is an integer number (10605551064).

Almost surely, 2^21211102127 is an apocalyptic number.

21211102127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211102127 is an equidigital number, since it uses as much as digits as its factorization.

21211102127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21211102127 its reverse (72120111212), we get a palindrome (93331213339).

The spelling of 21211102127 in words is "twenty-one billion, two hundred eleven million, one hundred two thousand, one hundred twenty-seven".