21623327 has 16 divisors (see below), whose sum is σ = 24192000. Its totient is φ = 19163040.

The previous prime is 21623321. The next prime is 21623347. The reversal of 21623327 is 72332612.

It is a cyclic number.

It is not a de Polignac number, because 21623327 - 2¹² = 21619231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21623296 and 21623305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129398 + ... + 129564.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^21623327 is an apocalyptic number.

21623327 is a deficient number, since it is larger than the sum of its proper divisors (2568673).

21623327 is a wasteful number, since it uses less digits than its factorization.

21623327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406.

The product of its digits is 3024, while the sum is 26.

The square root of 21623327 is about 4650.0889238809. The cubic root of 21623327 is about 278.5955479695.

Adding to 21623327 its reverse (72332612), we get a palindrome (93955939).

The spelling of 21623327 in words is "twenty-one million, six hundred twenty-three thousand, three hundred twenty-seven".