21927525 has 12 divisors (see below), whose sum is σ = 36253632. Its totient is φ = 11694640.

The previous prime is 21927523. The next prime is 21927547. The reversal of 21927525 is 52572912.

It is a happy number.

It is not a de Polignac number, because 21927525 - 2¹ = 21927523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21927523) 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 11 ways as a sum of consecutive naturals, for example, 146109 + ... + 146258.

It is an arithmetic number, because the mean of its divisors is an integer number (3021136).

Almost surely, 2^21927525 is an apocalyptic number.

21927525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21927525 is a deficient number, since it is larger than the sum of its proper divisors (14326107).

21927525 is a wasteful number, since it uses less digits than its factorization.

21927525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292380 (or 292375 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 21927525 is about 4682.6835255012. The cubic root of 21927525 is about 279.8959009284.

The spelling of 21927525 in words is "twenty-one million, nine hundred twenty-seven thousand, five hundred twenty-five".