21820444068 has 24 divisors (see below), whose sum is σ = 51280663840. Its totient is φ = 7221153600.

The previous prime is 21820444067. The next prime is 21820444099. The reversal of 21820444068 is 86044402812.

It is a super-2 number, since 2×21820444068² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21820444067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6539233 + ... + 6542568.

Almost surely, 2^21820444068 is an apocalyptic number.

It is an amenable number.

21820444068 is an abundant number, since it is smaller than the sum of its proper divisors (29460219772).

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

21820444068 is a wasteful number, since it uses less digits than its factorization.

21820444068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13081947 (or 13081945 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 39.

The spelling of 21820444068 in words is "twenty-one billion, eight hundred twenty million, four hundred forty-four thousand, sixty-eight".