21835525 has 6 divisors (see below), whose sum is σ = 27076082. Its totient is φ = 17468400.

The previous prime is 21835511. The next prime is 21835547. The reversal of 21835525 is 52553812.

It can be written as a sum of positive squares in 3 ways, for example, as 3849444 + 17986081 = 1962^2 + 4241^2 .

It is not a de Polignac number, because 21835525 - 2¹⁵ = 21802757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 436686 + ... + 436735.

Almost surely, 2^21835525 is an apocalyptic number.

21835525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21835525 is a deficient number, since it is larger than the sum of its proper divisors (5240557).

21835525 is an equidigital number, since it uses as much as digits as its factorization.

21835525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873431 (or 873426 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 21835525 is about 4672.8497728902. The cubic root of 21835525 is about 279.5039047162.

The spelling of 21835525 in words is "twenty-one million, eight hundred thirty-five thousand, five hundred twenty-five".