21552595459 has 4 divisors (see below), whose sum is σ = 21552890920. Its totient is φ = 21552300000.

The previous prime is 21552595439. The next prime is 21552595543. The reversal of 21552595459 is 95459525512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21552595459 - 2⁷ = 21552595331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21552595439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49147 + ... + 213355.

It is an arithmetic number, because the mean of its divisors is an integer number (5388222730).

Almost surely, 2^21552595459 is an apocalyptic number.

21552595459 is a deficient number, since it is larger than the sum of its proper divisors (295461).

21552595459 is a wasteful number, since it uses less digits than its factorization.

21552595459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295460.

The product of its digits is 4050000, while the sum is 52.

The spelling of 21552595459 in words is "twenty-one billion, five hundred fifty-two million, five hundred ninety-five thousand, four hundred fifty-nine".