21326627 has 4 divisors (see below), whose sum is σ = 24373296. Its totient is φ = 18279960.

The previous prime is 21326623. The next prime is 21326633. The reversal of 21326627 is 72662312.

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

It is a cyclic number.

It is not a de Polignac number, because 21326627 - 2² = 21326623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21326627.

It is not an unprimeable number, because it can be changed into a prime (21326621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523324 + ... + 1523337.

It is an arithmetic number, because the mean of its divisors is an integer number (6093324).

Almost surely, 2^21326627 is an apocalyptic number.

21326627 is a deficient number, since it is larger than the sum of its proper divisors (3046669).

21326627 is an equidigital number, since it uses as much as digits as its factorization.

21326627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3046668.

The product of its digits is 6048, while the sum is 29.

The square root of 21326627 is about 4618.0761145741. The cubic root of 21326627 is about 277.3154447455.

Adding to 21326627 its reverse (72662312), we get a palindrome (93988939).

The spelling of 21326627 in words is "twenty-one million, three hundred twenty-six thousand, six hundred twenty-seven".