21525326 has 4 divisors (see below), whose sum is σ = 32287992. Its totient is φ = 10762662.

The previous prime is 21525319. The next prime is 21525331. The reversal of 21525326 is 62352512.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21525295 and 21525304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5381330 + ... + 5381333.

It is an arithmetic number, because the mean of its divisors is an integer number (8071998).

Almost surely, 2^21525326 is an apocalyptic number.

21525326 is a deficient number, since it is larger than the sum of its proper divisors (10762666).

21525326 is a wasteful number, since it uses less digits than its factorization.

21525326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10762665.

The product of its digits is 3600, while the sum is 26.

The square root of 21525326 is about 4639.5394167956. The cubic root of 21525326 is about 278.1740279852.

Adding to 21525326 its reverse (62352512), we get a palindrome (83877838).

The spelling of 21525326 in words is "twenty-one million, five hundred twenty-five thousand, three hundred twenty-six".