21326545 has 8 divisors (see below), whose sum is σ = 25631424. Its totient is φ = 17034864.

The previous prime is 21326537. The next prime is 21326561. The reversal of 21326545 is 54562312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21326545 - 2³ = 21326537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (3203928).

Almost surely, 2^21326545 is an apocalyptic number.

It is an amenable number.

21326545 is a deficient number, since it is larger than the sum of its proper divisors (4304879).

21326545 is an equidigital number, since it uses as much as digits as its factorization.

21326545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6599.

The product of its digits is 7200, while the sum is 28.

The square root of 21326545 is about 4618.0672364096. The cubic root of 21326545 is about 277.3150893229.

Adding to 21326545 its reverse (54562312), we get a palindrome (75888857).

The spelling of 21326545 in words is "twenty-one million, three hundred twenty-six thousand, five hundred forty-five".