21678850460 has 12 divisors (see below), whose sum is σ = 45525586008. Its totient is φ = 8671540176.

The previous prime is 21678850447. The next prime is 21678850469. The reversal of 21678850460 is 6405887612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21678850469) 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, 541971242 + ... + 541971281.

It is an arithmetic number, because the mean of its divisors is an integer number (3793798834).

Almost surely, 2^21678850460 is an apocalyptic number.

21678850460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21678850460 is an abundant number, since it is smaller than the sum of its proper divisors (23846735548).

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

21678850460 is a wasteful number, since it uses less digits than its factorization.

21678850460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083942532 (or 1083942530 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 21678850460 in words is "twenty-one billion, six hundred seventy-eight million, eight hundred fifty thousand, four hundred sixty".