21875045 has 8 divisors (see below), whose sum is σ = 26320896. Its totient is φ = 17452816.

The previous prime is 21875041. The next prime is 21875071. The reversal of 21875045 is 54057812.

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

It is a cyclic number.

It is not a de Polignac number, because 21875045 - 2² = 21875041 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21875041) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3797 + ... + 7626.

It is an arithmetic number, because the mean of its divisors is an integer number (3290112).

Almost surely, 2^21875045 is an apocalyptic number.

It is an amenable number.

21875045 is a deficient number, since it is larger than the sum of its proper divisors (4445851).

21875045 is a wasteful number, since it uses less digits than its factorization.

21875045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11811.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 21875045 is about 4677.0765441673. The cubic root of 21875045 is about 279.6724272955.

The spelling of 21875045 in words is "twenty-one million, eight hundred seventy-five thousand, forty-five".