21525675 has 24 divisors (see below), whose sum is σ = 36555696. Its totient is φ = 11168640.

The previous prime is 21525667. The next prime is 21525703. The reversal of 21525675 is 57652512.

It is not a de Polignac number, because 21525675 - 2³ = 21525667 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1104 + ... + 6653.

It is an arithmetic number, because the mean of its divisors is an integer number (1523154).

Almost surely, 2^21525675 is an apocalyptic number.

21525675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21525675 is a deficient number, since it is larger than the sum of its proper divisors (15030021).

21525675 is a wasteful number, since it uses less digits than its factorization.

21525675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7807 (or 7802 counting only the distinct ones).

The product of its digits is 21000, while the sum is 33.

The square root of 21525675 is about 4639.5770281352. The cubic root of 21525675 is about 278.1755313648.

The spelling of 21525675 in words is "twenty-one million, five hundred twenty-five thousand, six hundred seventy-five".