21598334866 has 8 divisors (see below), whose sum is σ = 32787833904. Its totient is φ = 10669056900.

The previous prime is 21598334827. The next prime is 21598334867. The reversal of 21598334866 is 66843389512.

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

It is a super-4 number, since 4×21598334866⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21598334867) 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, 65055060 + ... + 65055391.

It is an arithmetic number, because the mean of its divisors is an integer number (4098479238).

Almost surely, 2^21598334866 is an apocalyptic number.

21598334866 is a deficient number, since it is larger than the sum of its proper divisors (11189499038).

21598334866 is a wasteful number, since it uses less digits than its factorization.

21598334866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130110536.

The product of its digits is 7464960, while the sum is 55.

The spelling of 21598334866 in words is "twenty-one billion, five hundred ninety-eight million, three hundred thirty-four thousand, eight hundred sixty-six".