21852123 has 8 divisors (see below), whose sum is σ = 30850128. Its totient is φ = 13711104.

The previous prime is 21852121. The next prime is 21852137. The reversal of 21852123 is 32125812.

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

It is not a de Polignac number, because 21852123 - 2¹ = 21852121 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21852093 and 21852102.

It is not an unprimeable number, because it can be changed into a prime (21852121) 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, 214186 + ... + 214287.

It is an arithmetic number, because the mean of its divisors is an integer number (3856266).

Almost surely, 2^21852123 is an apocalyptic number.

21852123 is a deficient number, since it is larger than the sum of its proper divisors (8998005).

21852123 is a wasteful number, since it uses less digits than its factorization.

21852123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428493.

The product of its digits is 960, while the sum is 24.

The square root of 21852123 is about 4674.6254395406. The cubic root of 21852123 is about 279.5747072399.

Adding to 21852123 its reverse (32125812), we get a palindrome (53977935).

The spelling of 21852123 in words is "twenty-one million, eight hundred fifty-two thousand, one hundred twenty-three".