21678485460 has 48 divisors (see below), whose sum is σ = 60711395136. Its totient is φ = 5779821312.

The previous prime is 21678485447. The next prime is 21678485471. The reversal of 21678485460 is 6458487612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309192 + ... + 372768.

It is an arithmetic number, because the mean of its divisors is an integer number (1264820732).

Almost surely, 2^21678485460 is an apocalyptic number.

21678485460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21678485460 is an abundant number, since it is smaller than the sum of its proper divisors (39032909676).

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

21678485460 is a wasteful number, since it uses less digits than its factorization.

21678485460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69272 (or 69270 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 51.

The spelling of 21678485460 in words is "twenty-one billion, six hundred seventy-eight million, four hundred eighty-five thousand, four hundred sixty".