21474223 has 2 divisors, whose sum is σ = 21474224. Its totient is φ = 21474222.

The previous prime is 21474217. The next prime is 21474241. The reversal of 21474223 is 32247412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21474223 - 2¹⁷ = 21343151 is a prime.

It is a super-2 number, since 2×21474223² = 922284506907458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21474293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10737111 + 10737112.

It is an arithmetic number, because the mean of its divisors is an integer number (10737112).

Almost surely, 2^21474223 is an apocalyptic number.

21474223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21474223 is an equidigital number, since it uses as much as digits as its factorization.

21474223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 25.

The square root of 21474223 is about 4634.0288087149. The cubic root of 21474223 is about 277.9537170850.

The spelling of 21474223 in words is "twenty-one million, four hundred seventy-four thousand, two hundred twenty-three".