21492525 has 24 divisors (see below), whose sum is σ = 35667360. Its totient is φ = 11419840.

The previous prime is 21492479. The next prime is 21492533. The reversal of 21492525 is 52529412.

It is not a de Polignac number, because 21492525 - 2⁹ = 21492013 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21492492 and 21492501.

It is a congruent number.

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, 37894 + ... + 38456.

It is an arithmetic number, because the mean of its divisors is an integer number (1486140).

Almost surely, 2^21492525 is an apocalyptic number.

21492525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21492525 is a deficient number, since it is larger than the sum of its proper divisors (14174835).

21492525 is a wasteful number, since it uses less digits than its factorization.

21492525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1080 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 21492525 is about 4636.0031276952. The cubic root of 21492525 is about 278.0326592412.

The spelling of 21492525 in words is "twenty-one million, four hundred ninety-two thousand, five hundred twenty-five".