21389376527 has 2 divisors, whose sum is σ = 21389376528. Its totient is φ = 21389376526.

The previous prime is 21389376487. The next prime is 21389376581. The reversal of 21389376527 is 72567398312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21389376527 - 2²⁰ = 21388327951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21389396527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694688263 + 10694688264.

It is an arithmetic number, because the mean of its divisors is an integer number (10694688264).

Almost surely, 2^21389376527 is an apocalyptic number.

21389376527 is a deficient number, since it is larger than the sum of its proper divisors (1).

21389376527 is an equidigital number, since it uses as much as digits as its factorization.

21389376527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 53.

The spelling of 21389376527 in words is "twenty-one billion, three hundred eighty-nine million, three hundred seventy-six thousand, five hundred twenty-seven".