21507450188075 has 12 divisors (see below), whose sum is σ = 27067286567160. Its totient is φ = 16949154773760.

The previous prime is 21507450187939. The next prime is 21507450188113. The reversal of 21507450188075 is 57088105470512.

It is not a de Polignac number, because 21507450188075 - 2⁸ = 21507450187819 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6420132710 + ... + 6420136059.

It is an arithmetic number, because the mean of its divisors is an integer number (2255607213930).

Almost surely, 2^{21507450188075} is an apocalyptic number.

21507450188075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21507450188075 is a deficient number, since it is larger than the sum of its proper divisors (5559836379085).

21507450188075 is a wasteful number, since it uses less digits than its factorization.

21507450188075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12840268846 (or 12840268841 counting only the distinct ones).

The product of its (nonzero) digits is 3136000, while the sum is 53.

The spelling of 21507450188075 in words is "twenty-one trillion, five hundred seven billion, four hundred fifty million, one hundred eighty-eight thousand, seventy-five".