21152326 has 16 divisors (see below), whose sum is σ = 34750800. Its totient is φ = 9596448.

The previous prime is 21152321. The next prime is 21152333. The reversal of 21152326 is 62325112.

It is a junction number, because it is equal to n+sod(n) for n = 21152297 and 21152306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5361 + ... + 8428.

It is an arithmetic number, because the mean of its divisors is an integer number (2171925).

Almost surely, 2^21152326 is an apocalyptic number.

21152326 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21152326 is a deficient number, since it is larger than the sum of its proper divisors (13598474).

21152326 is a wasteful number, since it uses less digits than its factorization.

21152326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13863.

The product of its digits is 720, while the sum is 22.

The square root of 21152326 is about 4599.1657939239. The cubic root of 21152326 is about 276.5578840410.

Adding to 21152326 its reverse (62325112), we get a palindrome (83477438).

The spelling of 21152326 in words is "twenty-one million, one hundred fifty-two thousand, three hundred twenty-six".