21456427466 has 8 divisors (see below), whose sum is σ = 32193740964. Its totient is φ = 10725180480.

The previous prime is 21456427463. The next prime is 21456427469. The reversal of 21456427466 is 66472465412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21456427463) and next prime (21456427469).

It can be written as a sum of positive squares in 2 ways, for example, as 19732101841 + 1724325625 = 140471^2 + 41525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21456427466.

It is not an unprimeable number, because it can be changed into a prime (21456427463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507775 + ... + 1521938.

Almost surely, 2^21456427466 is an apocalyptic number.

21456427466 is a deficient number, since it is larger than the sum of its proper divisors (10737313498).

21456427466 is a wasteful number, since it uses less digits than its factorization.

21456427466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033256.

The product of its digits is 1935360, while the sum is 47.

The spelling of 21456427466 in words is "twenty-one billion, four hundred fifty-six million, four hundred twenty-seven thousand, four hundred sixty-six".