21875055 has 8 divisors (see below), whose sum is σ = 35000112. Its totient is φ = 11666688.

The previous prime is 21875041. The next prime is 21875071. The reversal of 21875055 is 55057812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21875055 - 2⁶ = 21874991 is a prime.

It is a plaindrome in base 8.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729154 + ... + 729183.

It is an arithmetic number, because the mean of its divisors is an integer number (4375014).

Almost surely, 2^21875055 is an apocalyptic number.

21875055 is a deficient number, since it is larger than the sum of its proper divisors (13125057).

21875055 is a wasteful number, since it uses less digits than its factorization.

21875055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458345.

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

The square root of 21875055 is about 4677.0776132111. The cubic root of 21875055 is about 279.6724699121.

The spelling of 21875055 in words is "twenty-one million, eight hundred seventy-five thousand, fifty-five".