21875505 has 16 divisors (see below), whose sum is σ = 35069760. Its totient is φ = 11643968.

The previous prime is 21875467. The next prime is 21875527. The reversal of 21875505 is 50557812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21875505 - 2⁷ = 21875377 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8779 + ... + 10991.

It is an arithmetic number, because the mean of its divisors is an integer number (2191860).

Almost surely, 2^21875505 is an apocalyptic number.

It is an amenable number.

21875505 is a deficient number, since it is larger than the sum of its proper divisors (13194255).

21875505 is a wasteful number, since it uses less digits than its factorization.

21875505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880.

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 21875505 is about 4677.1257199267. The cubic root of 21875505 is about 279.6743876482.

The spelling of 21875505 in words is "twenty-one million, eight hundred seventy-five thousand, five hundred five".