21275471686 has 16 divisors (see below), whose sum is σ = 36514520064. Its totient is φ = 9107488584.

The previous prime is 21275471683. The next prime is 21275471699. The reversal of 21275471686 is 68617457212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275471681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868380 + ... + 892543.

It is an arithmetic number, because the mean of its divisors is an integer number (2282157504).

Almost surely, 2^21275471686 is an apocalyptic number.

21275471686 is a deficient number, since it is larger than the sum of its proper divisors (15239048378).

21275471686 is a wasteful number, since it uses less digits than its factorization.

21275471686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761795.

The product of its digits is 1128960, while the sum is 49.

The spelling of 21275471686 in words is "twenty-one billion, two hundred seventy-five million, four hundred seventy-one thousand, six hundred eighty-six".