21323526 has 96 divisors (see below), whose sum is σ = 53434080. Its totient is φ = 5644800.

The previous prime is 21323521. The next prime is 21323527. The reversal of 21323526 is 62532312.

It is a super-2 number, since 2×21323526² = 909385522145352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21323496 and 21323505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 349536 + ... + 349596.

It is an arithmetic number, because the mean of its divisors is an integer number (556605).

Almost surely, 2^21323526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21323526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26717040).

21323526 is an abundant number, since it is smaller than the sum of its proper divisors (32110554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323526 is a wasteful number, since it uses less digits than its factorization.

21323526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 143 counting only the distinct ones).

The product of its digits is 2160, while the sum is 24.

The square root of 21323526 is about 4617.7403564947. The cubic root of 21323526 is about 277.3020030688.

Adding to 21323526 its reverse (62532312), we get a palindrome (83855838).

The spelling of 21323526 in words is "twenty-one million, three hundred twenty-three thousand, five hundred twenty-six".