21852343 has 2 divisors, whose sum is σ = 21852344. Its totient is φ = 21852342.

The previous prime is 21852317. The next prime is 21852353. The reversal of 21852343 is 34325812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21852343 - 2²¹ = 19755191 is a prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21852353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10926171 + 10926172.

It is an arithmetic number, because the mean of its divisors is an integer number (10926172).

Almost surely, 2^21852343 is an apocalyptic number.

21852343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21852343 is an equidigital number, since it uses as much as digits as its factorization.

21852343 is an evil number, because the sum of its binary digits is even.

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

The square root of 21852343 is about 4674.6489707784. The cubic root of 21852343 is about 279.5756454589.

The spelling of 21852343 in words is "twenty-one million, eight hundred fifty-two thousand, three hundred forty-three".