21466455457 has 8 divisors (see below), whose sum is σ = 21493229184. Its totient is φ = 21439700688.

The previous prime is 21466455449. The next prime is 21466455499. The reversal of 21466455457 is 75455466412.

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

It is a cyclic number.

It is not a de Polignac number, because 21466455457 - 2³ = 21466455449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21466455457.

It is not an unprimeable number, because it can be changed into a prime (21466455557) 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 7 ways as a sum of consecutive naturals, for example, 4340328 + ... + 4345270.

It is an arithmetic number, because the mean of its divisors is an integer number (2686653648).

Almost surely, 2^21466455457 is an apocalyptic number.

It is an amenable number.

21466455457 is a deficient number, since it is larger than the sum of its proper divisors (26773727).

21466455457 is a wasteful number, since it uses less digits than its factorization.

21466455457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9479.

The product of its digits is 4032000, while the sum is 49.

The spelling of 21466455457 in words is "twenty-one billion, four hundred sixty-six million, four hundred fifty-five thousand, four hundred fifty-seven".