21085763147868 has 96 divisors (see below), whose sum is σ = 50083536900096. Its totient is φ = 6903033838272.

The previous prime is 21085763147863. The next prime is 21085763147929. The reversal of 21085763147868 is 86874136758012.

It is a junction number, because it is equal to n+sod(n) for n = 21085763147799 and 21085763147808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21085763147863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 506811955 + ... + 506853557.

It is an arithmetic number, because the mean of its divisors is an integer number (521703509376).

Almost surely, 2^{21085763147868} is an apocalyptic number.

It is an amenable number.

21085763147868 is an abundant number, since it is smaller than the sum of its proper divisors (28997773752228).

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

21085763147868 is a wasteful number, since it uses less digits than its factorization.

21085763147868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43543 (or 43541 counting only the distinct ones).

The product of its (nonzero) digits is 108380160, while the sum is 66.

The spelling of 21085763147868 in words is "twenty-one trillion, eighty-five billion, seven hundred sixty-three million, one hundred forty-seven thousand, eight hundred sixty-eight".