21427727466 has 16 divisors (see below), whose sum is σ = 44333229600. Its totient is φ = 6896280048.

The previous prime is 21427727441. The next prime is 21427727471. The reversal of 21427727466 is 66472772412.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61573756 + ... + 61574103.

It is an arithmetic number, because the mean of its divisors is an integer number (2770826850).

Almost surely, 2^21427727466 is an apocalyptic number.

21427727466 is an abundant number, since it is smaller than the sum of its proper divisors (22905502134).

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

21427727466 is a wasteful number, since it uses less digits than its factorization.

21427727466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123147893.

The product of its digits is 1580544, while the sum is 48.

The spelling of 21427727466 in words is "twenty-one billion, four hundred twenty-seven million, seven hundred twenty-seven thousand, four hundred sixty-six".