21125334127 has 2 divisors, whose sum is σ = 21125334128. Its totient is φ = 21125334126.

The previous prime is 21125334089. The next prime is 21125334157. The reversal of 21125334127 is 72143352112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21125334127 - 2¹¹ = 21125332079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21125334157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562667063 + 10562667064.

It is an arithmetic number, because the mean of its divisors is an integer number (10562667064).

Almost surely, 2^21125334127 is an apocalyptic number.

21125334127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21125334127 is an equidigital number, since it uses as much as digits as its factorization.

21125334127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

Adding to 21125334127 its reverse (72143352112), we get a palindrome (93268686239).

The spelling of 21125334127 in words is "twenty-one billion, one hundred twenty-five million, three hundred thirty-four thousand, one hundred twenty-seven".