21452975 has 12 divisors (see below), whose sum is σ = 26695464. Its totient is φ = 17101920.

The previous prime is 21452947. The next prime is 21452989. The reversal of 21452975 is 57925412.

It is not a de Polignac number, because 21452975 - 2¹⁶ = 21387439 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 6572 + ... + 9278.

It is an arithmetic number, because the mean of its divisors is an integer number (2224622).

Almost surely, 2^21452975 is an apocalyptic number.

21452975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21452975 is a deficient number, since it is larger than the sum of its proper divisors (5242489).

21452975 is a wasteful number, since it uses less digits than its factorization.

21452975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034 (or 3029 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 21452975 is about 4631.7356358065. The cubic root of 21452975 is about 277.8620116394.

The spelling of 21452975 in words is "twenty-one million, four hundred fifty-two thousand, nine hundred seventy-five".