21903173526042 has 24 divisors (see below), whose sum is σ = 48739494244116. Its totient is φ = 7103731954176.

The previous prime is 21903173526029. The next prime is 21903173526089. The reversal of 21903173526042 is 24062537130912.

It is a happy number.

21903173526042 is a `hidden beast` number, since 2 + 1 + 9 + 0 + 3 + 1 + 7 + 35 + 2 + 604 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21902765041521 + 408484521 = 4680039^2 + 20211^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16443823303 + ... + 16443824634.

Almost surely, 2^{21903173526042} is an apocalyptic number.

21903173526042 is an abundant number, since it is smaller than the sum of its proper divisors (26836320718074).

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

21903173526042 is a wasteful number, since it uses less digits than its factorization.

21903173526042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32887647982 (or 32887647979 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 21903173526042 in words is "twenty-one trillion, nine hundred three billion, one hundred seventy-three million, five hundred twenty-six thousand, forty-two".