21396586827 has 16 divisors (see below), whose sum is σ = 35568352512. Its totient is φ = 11115109920.

The previous prime is 21396586823. The next prime is 21396586829. The reversal of 21396586827 is 72868569312.

It is not a de Polignac number, because 21396586827 - 2² = 21396586823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21396586823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46312728 + ... + 46313189.

It is an arithmetic number, because the mean of its divisors is an integer number (2223022032).

Almost surely, 2^21396586827 is an apocalyptic number.

21396586827 is a deficient number, since it is larger than the sum of its proper divisors (14171765685).

21396586827 is a wasteful number, since it uses less digits than its factorization.

21396586827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92625938.

The product of its digits is 8709120, while the sum is 57.

The spelling of 21396586827 in words is "twenty-one billion, three hundred ninety-six million, five hundred eighty-six thousand, eight hundred twenty-seven".