21755421445068 has 144 divisors (see below), whose sum is σ = 57987689760000. Its totient is φ = 6863825105280.

The previous prime is 21755421445013. The next prime is 21755421445157. The reversal of 21755421445068 is 86054412455712.

21755421445068 is a `hidden beast` number, since 2 + 1 + 7 + 5 + 542 + 1 + 44 + 50 + 6 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37567983 + ... + 38142681.

It is an arithmetic number, because the mean of its divisors is an integer number (402692290000).

Almost surely, 2^{21755421445068} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21755421445068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28993844880000).

21755421445068 is an abundant number, since it is smaller than the sum of its proper divisors (36232268314932).

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

21755421445068 is a wasteful number, since it uses less digits than its factorization.

21755421445068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575212 (or 575207 counting only the distinct ones).

The product of its (nonzero) digits is 10752000, while the sum is 54.

The spelling of 21755421445068 in words is "twenty-one trillion, seven hundred fifty-five billion, four hundred twenty-one million, four hundred forty-five thousand, sixty-eight".