21659303241 has 9 divisors (see below), whose sum is σ = 31286297991. Its totient is φ = 14439241152.

The previous prime is 21659303227. The next prime is 21659303257. The reversal of 21659303241 is 14230395612.

The square root of 21659303241 is 147171.

It is a perfect power (a square), and thus also a powerful number.

21659303241 is a `hidden beast` number, since 21 + 6 + 593 + 0 + 3 + 2 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17626545225 + 4032758016 = 132765^2 + 63504^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 21659303241 - 2¹⁵ = 21659270473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21659303196 and 21659303205.

It is not an unprimeable number, because it can be changed into a prime (21659303041) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 416985 + ... + 466041.

Almost surely, 2^21659303241 is an apocalyptic number.

21659303241 is the 147171-st square number.

21659303241 is the 73586-th centered octagonal number.

It is an amenable number.

21659303241 is a deficient number, since it is larger than the sum of its proper divisors (9626994750).

21659303241 is an frugal number, since it uses more digits than its factorization.

21659303241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98120 (or 49060 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

Multiplying 21659303241 by its sum of digits (36), we get a square (779734916676 = 883026²).

Adding to 21659303241 its reverse (14230395612), we get a palindrome (35889698853).

It can be divided in two parts, 21659 and 303241, that added together give a square (324900 = 570²).

The spelling of 21659303241 in words is "twenty-one billion, six hundred fifty-nine million, three hundred three thousand, two hundred forty-one".