21358855205001 has 24 divisors (see below), whose sum is σ = 33426170125920. Its totient is φ = 13089968712576.

The previous prime is 21358855204987. The next prime is 21358855205027. The reversal of 21358855205001 is 10050255885312.

21358855205001 is a `hidden beast` number, since 2 + 13 + 5 + 8 + 85 + 52 + 0 + 500 + 1 = 666.

It is not a de Polignac number, because 21358855205001 - 2¹¹ = 21358855202953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21358855205081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1623253431 + ... + 1623266588.

It is an arithmetic number, because the mean of its divisors is an integer number (1392757088580).

Almost surely, 2^{21358855205001} is an apocalyptic number.

It is an amenable number.

21358855205001 is a deficient number, since it is larger than the sum of its proper divisors (12067314920919).

21358855205001 is a wasteful number, since it uses less digits than its factorization.

21358855205001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246520085 (or 3246520082 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 45.

The spelling of 21358855205001 in words is "twenty-one trillion, three hundred fifty-eight billion, eight hundred fifty-five million, two hundred five thousand, one".