21040158489840 has 480 divisors, whose sum is σ = 82164583987200. Its totient is φ = 4725264936960.

The previous prime is 21040158489787. The next prime is 21040158489859. The reversal of 21040158489840 is 4898485104012.

21040158489840 is a `hidden beast` number, since 2 + 1 + 0 + 4 + 0 + 158 + 489 + 8 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 621168105 + ... + 621201975.

It is an arithmetic number, because the mean of its divisors is an integer number (171176216640).

Almost surely, 2^{21040158489840} is an apocalyptic number.

21040158489840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21040158489840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41082291993600).

21040158489840 is an abundant number, since it is smaller than the sum of its proper divisors (61124425497360).

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

21040158489840 is a wasteful number, since it uses less digits than its factorization.

21040158489840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36045 (or 36036 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 54.

The spelling of 21040158489840 in words is "twenty-one trillion, forty billion, one hundred fifty-eight million, four hundred eighty-nine thousand, eight hundred forty".