21598334868 has 48 divisors (see below), whose sum is σ = 55020994560. Its totient is φ = 6539781600.

The previous prime is 21598334867. The next prime is 21598334881. The reversal of 21598334868 is 86843389512.

It is a super-4 number, since 4×21598334868⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 104863 + ... + 232793.

It is an arithmetic number, because the mean of its divisors is an integer number (1146270720).

Almost surely, 2^21598334868 is an apocalyptic number.

It is an amenable number.

21598334868 is an abundant number, since it is smaller than the sum of its proper divisors (33422659692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21598334868 is a wasteful number, since it uses less digits than its factorization.

21598334868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129228 (or 129226 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 57.

The spelling of 21598334868 in words is "twenty-one billion, five hundred ninety-eight million, three hundred thirty-four thousand, eight hundred sixty-eight".