21852641 has 4 divisors (see below), whose sum is σ = 23002800. Its totient is φ = 20702484.

The previous prime is 21852617. The next prime is 21852659. The reversal of 21852641 is 14625812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21852641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21852601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575051 + ... + 575088.

It is an arithmetic number, because the mean of its divisors is an integer number (5750700).

Almost surely, 2^21852641 is an apocalyptic number.

It is an amenable number.

21852641 is a deficient number, since it is larger than the sum of its proper divisors (1150159).

21852641 is a wasteful number, since it uses less digits than its factorization.

21852641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150158.

The product of its digits is 3840, while the sum is 29.

The square root of 21852641 is about 4674.6808447208. The cubic root of 21852641 is about 279.5769163091.

The spelling of 21852641 in words is "twenty-one million, eight hundred fifty-two thousand, six hundred forty-one".