21938588398468 has 24 divisors (see below), whose sum is σ = 44192839947200. Its totient is φ = 9334610067168.

The previous prime is 21938588398421. The next prime is 21938588398469. The reversal of 21938588398468 is 86489388583912.

It is a junction number, because it is equal to n+sod(n) for n = 21938588398391 and 21938588398400.

It is not an unprimeable number, because it can be changed into a prime (21938588398469) 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, 2818417023 + ... + 2818424806.

Almost surely, 2^{21938588398468} is an apocalyptic number.

21938588398468 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21938588398468 is an abundant number, since it is smaller than the sum of its proper divisors (22254251548732).

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

21938588398468 is a wasteful number, since it uses less digits than its factorization.

21938588398468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5636841979 (or 5636841977 counting only the distinct ones).

The product of its digits is 5733089280, while the sum is 82.

The spelling of 21938588398468 in words is "twenty-one trillion, nine hundred thirty-eight billion, five hundred eighty-eight million, three hundred ninety-eight thousand, four hundred sixty-eight".