21550322563 has 16 divisors (see below), whose sum is σ = 26892532224. Its totient is φ = 16777085760.

The previous prime is 21550322539. The next prime is 21550322579. The reversal of 21550322563 is 36522305512.

It is a cyclic number.

It is not a de Polignac number, because 21550322563 - 2¹³ = 21550314371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21550322503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43095 + ... + 212032.

It is an arithmetic number, because the mean of its divisors is an integer number (1680783264).

Almost surely, 2^21550322563 is an apocalyptic number.

21550322563 is a deficient number, since it is larger than the sum of its proper divisors (5342209661).

21550322563 is a wasteful number, since it uses less digits than its factorization.

21550322563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256242.

The product of its (nonzero) digits is 54000, while the sum is 34.

The spelling of 21550322563 in words is "twenty-one billion, five hundred fifty million, three hundred twenty-two thousand, five hundred sixty-three".