21456522223313 has 4 divisors (see below), whose sum is σ = 21459737653668. Its totient is φ = 21453306792960.

The previous prime is 21456522223277. The next prime is 21456522223319. The reversal of 21456522223313 is 31332222565412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4247440708624 + 17209081514689 = 2060932^2 + 4148383^2 .

It is a cyclic number.

It is not a de Polignac number, because 21456522223313 - 2⁸ = 21456522223057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21456522223319) 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, 1607705168 + ... + 1607718513.

It is an arithmetic number, because the mean of its divisors is an integer number (5364934413417).

Almost surely, 2^{21456522223313} is an apocalyptic number.

It is an amenable number.

21456522223313 is a deficient number, since it is larger than the sum of its proper divisors (3215430355).

21456522223313 is an equidigital number, since it uses as much as digits as its factorization.

21456522223313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3215430354.

The product of its digits is 518400, while the sum is 41.

Adding to 21456522223313 its reverse (31332222565412), we get a palindrome (52788744788725).

The spelling of 21456522223313 in words is "twenty-one trillion, four hundred fifty-six billion, five hundred twenty-two million, two hundred twenty-three thousand, three hundred thirteen".