21224521656259 has 4 divisors (see below), whose sum is σ = 21282354140704. Its totient is φ = 21166689171816.

The previous prime is 21224521656199. The next prime is 21224521656311. The reversal of 21224521656259 is 95265612542212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21224521656259 - 2⁹ = 21224521655747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21224528656259) 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, 28916241672 + ... + 28916242405.

It is an arithmetic number, because the mean of its divisors is an integer number (5320588535176).

Almost surely, 2^{21224521656259} is an apocalyptic number.

21224521656259 is a deficient number, since it is larger than the sum of its proper divisors (57832484445).

21224521656259 is an equidigital number, since it uses as much as digits as its factorization.

21224521656259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57832484444.

The product of its digits is 5184000, while the sum is 52.

The spelling of 21224521656259 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred twenty-one million, six hundred fifty-six thousand, two hundred fifty-nine".