21125927 has 8 divisors (see below), whose sum is σ = 21796800. Its totient is φ = 20460384.

The previous prime is 21125887. The next prime is 21125933. The reversal of 21125927 is 72952112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21125927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21125927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7649 + ... + 10037.

It is an arithmetic number, because the mean of its divisors is an integer number (2724600).

Almost surely, 2^21125927 is an apocalyptic number.

21125927 is a deficient number, since it is larger than the sum of its proper divisors (670873).

21125927 is a wasteful number, since it uses less digits than its factorization.

21125927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665.

The product of its digits is 2520, while the sum is 29.

The square root of 21125927 is about 4596.2949209118. The cubic root of 21125927 is about 276.4427841548.

The spelling of 21125927 in words is "twenty-one million, one hundred twenty-five thousand, nine hundred twenty-seven".