21424800664057 has 4 divisors (see below), whose sum is σ = 24485486473216. Its totient is φ = 18364114854900.

The previous prime is 21424800664021. The next prime is 21424800664093. The reversal of 21424800664057 is 75046600842412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21424800664021) and next prime (21424800664093).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21424800664057 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 21424800664057.

It is not an unprimeable number, because it can be changed into a prime (21424800604057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530342904569 + ... + 1530342904582.

It is an arithmetic number, because the mean of its divisors is an integer number (6121371618304).

Almost surely, 2^{21424800664057} is an apocalyptic number.

It is an amenable number.

21424800664057 is a deficient number, since it is larger than the sum of its proper divisors (3060685809159).

21424800664057 is an equidigital number, since it uses as much as digits as its factorization.

21424800664057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060685809158.

The product of its (nonzero) digits is 2580480, while the sum is 49.

The spelling of 21424800664057 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred million, six hundred sixty-four thousand, fifty-seven".