21548323 has 2 divisors, whose sum is σ = 21548324. Its totient is φ = 21548322.

The previous prime is 21548291. The next prime is 21548381. The reversal of 21548323 is 32384512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21548323 - 2⁵ = 21548291 is a prime.

It is a super-2 number, since 2×21548323² = 928660448224658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21548291 and 21548300.

It is not a weakly prime, because it can be changed into another prime (21548383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10774161 + 10774162.

It is an arithmetic number, because the mean of its divisors is an integer number (10774162).

Almost surely, 2^21548323 is an apocalyptic number.

21548323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21548323 is an equidigital number, since it uses as much as digits as its factorization.

21548323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 28.

The square root of 21548323 is about 4642.0171262071. The cubic root of 21548323 is about 278.2730569351.

The spelling of 21548323 in words is "twenty-one million, five hundred forty-eight thousand, three hundred twenty-three".