21854323 has 4 divisors (see below), whose sum is σ = 22131040. Its totient is φ = 21577608.

The previous prime is 21854317. The next prime is 21854341. The reversal of 21854323 is 32345812.

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 21854323 - 2¹³ = 21846131 is a prime.

It is a super-2 number, since 2×21854323² = 955222867576658, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21854291 and 21854300.

It is not an unprimeable number, because it can be changed into a prime (21854303) 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, 138240 + ... + 138397.

It is an arithmetic number, because the mean of its divisors is an integer number (5532760).

Almost surely, 2^21854323 is an apocalyptic number.

21854323 is a deficient number, since it is larger than the sum of its proper divisors (276717).

21854323 is an equidigital number, since it uses as much as digits as its factorization.

21854323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276716.

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

The square root of 21854323 is about 4674.8607465891. The cubic root of 21854323 is about 279.5840891463.

The spelling of 21854323 in words is "twenty-one million, eight hundred fifty-four thousand, three hundred twenty-three".