21458931749880 has 64 divisors (see below), whose sum is σ = 67765047638400. Its totient is φ = 5421203809920.

The previous prime is 21458931749809. The next prime is 21458931749903. The reversal of 21458931749880 is 8894713985412.

21458931749880 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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, 4705903806 + ... + 4705908365.

It is an arithmetic number, because the mean of its divisors is an integer number (1058828869350).

Almost surely, 2^{21458931749880} is an apocalyptic number.

21458931749880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21458931749880 is an abundant number, since it is smaller than the sum of its proper divisors (46306115888520).

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

21458931749880 is a wasteful number, since it uses less digits than its factorization.

21458931749880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411812204 (or 9411812200 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 69.

The spelling of 21458931749880 in words is "twenty-one trillion, four hundred fifty-eight billion, nine hundred thirty-one million, seven hundred forty-nine thousand, eight hundred eighty".