21255122359 has 4 divisors (see below), whose sum is σ = 21255991960. Its totient is φ = 21254252760.

The previous prime is 21255122327. The next prime is 21255122417. The reversal of 21255122359 is 95322155212.

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 21255122359 - 2⁵ = 21255122327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255122309) 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, 397044 + ... + 447385.

It is an arithmetic number, because the mean of its divisors is an integer number (5313997990).

Almost surely, 2^21255122359 is an apocalyptic number.

21255122359 is a deficient number, since it is larger than the sum of its proper divisors (869601).

21255122359 is an equidigital number, since it uses as much as digits as its factorization.

21255122359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869600.

The product of its digits is 54000, while the sum is 37.

The spelling of 21255122359 in words is "twenty-one billion, two hundred fifty-five million, one hundred twenty-two thousand, three hundred fifty-nine".