21032525 has 12 divisors (see below), whose sum is σ = 27453600. Its totient is φ = 15940080.

The previous prime is 21032521. The next prime is 21032527. The reversal of 21032525 is 52523012.

It is not a de Polignac number, because 21032525 - 2² = 21032521 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21032497 and 21032506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21665 + ... + 22614.

It is an arithmetic number, because the mean of its divisors is an integer number (2287800).

Almost surely, 2^21032525 is an apocalyptic number.

21032525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21032525 is a deficient number, since it is larger than the sum of its proper divisors (6421075).

21032525 is a wasteful number, since it uses less digits than its factorization.

21032525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44308 (or 44303 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21032525 is about 4586.1230903673. The cubic root of 21032525 is about 276.0347791011.

Adding to 21032525 its reverse (52523012), we get a palindrome (73555537).

The spelling of 21032525 in words is "twenty-one million, thirty-two thousand, five hundred twenty-five".