21252326 has 4 divisors (see below), whose sum is σ = 31878492. Its totient is φ = 10626162.

The previous prime is 21252323. The next prime is 21252337. The reversal of 21252326 is 62325212.

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

It is a super-2 number, since 2×21252326² = 903322720820552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5313080 + ... + 5313083.

It is an arithmetic number, because the mean of its divisors is an integer number (7969623).

Almost surely, 2^21252326 is an apocalyptic number.

21252326 is a deficient number, since it is larger than the sum of its proper divisors (10626166).

21252326 is a wasteful number, since it uses less digits than its factorization.

21252326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10626165.

The product of its digits is 1440, while the sum is 23.

The square root of 21252326 is about 4610.0245118654. The cubic root of 21252326 is about 276.9930185436.

Adding to 21252326 its reverse (62325212), we get a palindrome (83577538).

The spelling of 21252326 in words is "twenty-one million, two hundred fifty-two thousand, three hundred twenty-six".