21727427286 has 32 divisors (see below), whose sum is σ = 46147626720. Its totient is φ = 6796210176.

The previous prime is 21727427251. The next prime is 21727427317. The reversal of 21727427286 is 68272472712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281671 + ... + 350418.

It is an arithmetic number, because the mean of its divisors is an integer number (1442113335).

Almost surely, 2^21727427286 is an apocalyptic number.

21727427286 is an abundant number, since it is smaller than the sum of its proper divisors (24420199434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21727427286 is a wasteful number, since it uses less digits than its factorization.

21727427286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632448.

The product of its digits is 1053696, while the sum is 48.

Adding to 21727427286 its reverse (68272472712), we get a palindrome (89999899998).

The spelling of 21727427286 in words is "twenty-one billion, seven hundred twenty-seven million, four hundred twenty-seven thousand, two hundred eighty-six".