21606364258 has 8 divisors (see below), whose sum is σ = 32424041052. Its totient is φ = 10798350576.

The previous prime is 21606364187. The next prime is 21606364259. The reversal of 21606364258 is 85246360612.

It can be written as a sum of positive squares in 2 ways, for example, as 18266333409 + 3340030849 = 135153^2 + 57793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21606364259) 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, 2410185 + ... + 2419132.

Almost surely, 2^21606364258 is an apocalyptic number.

21606364258 is a deficient number, since it is larger than the sum of its proper divisors (10817676794).

21606364258 is a wasteful number, since it uses less digits than its factorization.

21606364258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4831556.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 21606364258 in words is "twenty-one billion, six hundred six million, three hundred sixty-four thousand, two hundred fifty-eight".