21952423 has 8 divisors (see below), whose sum is σ = 23284800. Its totient is φ = 20624640.

The previous prime is 21952387. The next prime is 21952459. The reversal of 21952423 is 32425912.

It is an interprime number because it is at equal distance from previous prime (21952387) and next prime (21952459).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21952423 - 2¹⁷ = 21821351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21952391 and 21952400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21952523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17218 + ... + 18448.

It is an arithmetic number, because the mean of its divisors is an integer number (2910600).

Almost surely, 2^21952423 is an apocalyptic number.

21952423 is a deficient number, since it is larger than the sum of its proper divisors (1332377).

21952423 is a wasteful number, since it uses less digits than its factorization.

21952423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297.

The product of its digits is 4320, while the sum is 28.

The square root of 21952423 is about 4685.3412895967. The cubic root of 21952423 is about 280.0017984578.

The spelling of 21952423 in words is "twenty-one million, nine hundred fifty-two thousand, four hundred twenty-three".