21466123 has 4 divisors (see below), whose sum is σ = 24532720. Its totient is φ = 18399528.

The previous prime is 21466103. The next prime is 21466141. The reversal of 21466123 is 32166412.

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

It is not a de Polignac number, because 21466123 - 2⁵ = 21466091 is a prime.

It is a super-2 number, since 2×21466123² = 921588873302258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21466103) 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 in 3 ways as a sum of consecutive naturals, for example, 1533288 + ... + 1533301.

It is an arithmetic number, because the mean of its divisors is an integer number (6133180).

Almost surely, 2^21466123 is an apocalyptic number.

21466123 is a deficient number, since it is larger than the sum of its proper divisors (3066597).

21466123 is an equidigital number, since it uses as much as digits as its factorization.

21466123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066596.

The product of its digits is 1728, while the sum is 25.

The square root of 21466123 is about 4633.1547567505. The cubic root of 21466123 is about 277.9187649745.

The spelling of 21466123 in words is "twenty-one million, four hundred sixty-six thousand, one hundred twenty-three".