21158431883480 has 64 divisors (see below), whose sum is σ = 47953995079680. Its totient is φ = 8401772822400.

The previous prime is 21158431883401. The next prime is 21158431883497. The reversal of 21158431883480 is 8438813485112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 877325 + ... + 6564035.

It is an arithmetic number, because the mean of its divisors is an integer number (749281173120).

Almost surely, 2^{21158431883480} is an apocalyptic number.

21158431883480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21158431883480 is an abundant number, since it is smaller than the sum of its proper divisors (26795563196200).

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

21158431883480 is a wasteful number, since it uses less digits than its factorization.

21158431883480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5687400 (or 5687396 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 56.

The spelling of 21158431883480 in words is "twenty-one trillion, one hundred fifty-eight billion, four hundred thirty-one million, eight hundred eighty-three thousand, four hundred eighty".