21446423 has 4 divisors (see below), whose sum is σ = 21459240. Its totient is φ = 21433608.

The previous prime is 21446417. The next prime is 21446431. The reversal of 21446423 is 32464412.

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 21446423 - 2⁴ = 21446407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21446392 and 21446401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21446443) 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, 3440 + ... + 7397.

It is an arithmetic number, because the mean of its divisors is an integer number (5364810).

Almost surely, 2^21446423 is an apocalyptic number.

21446423 is a deficient number, since it is larger than the sum of its proper divisors (12817).

21446423 is a wasteful number, since it uses less digits than its factorization.

21446423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12816.

The product of its digits is 4608, while the sum is 26.

The square root of 21446423 is about 4631.0282875405. The cubic root of 21446423 is about 277.8337212776.

The spelling of 21446423 in words is "twenty-one million, four hundred forty-six thousand, four hundred twenty-three".