21849843 has 16 divisors (see below), whose sum is σ = 29988000. Its totient is φ = 14142720.

The previous prime is 21849809. The next prime is 21849857. The reversal of 21849843 is 34894812.

It is not a de Polignac number, because 21849843 - 2⁸ = 21849587 is a prime.

It is a cake number, because a cake can be divided into 21849843 parts by 508 planar cuts.

It is not an unprimeable number, because it can be changed into a prime (21849803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42673 + ... + 43181.

It is an arithmetic number, because the mean of its divisors is an integer number (1874250).

Almost surely, 2^21849843 is an apocalyptic number.

21849843 is a deficient number, since it is larger than the sum of its proper divisors (8138157).

21849843 is a wasteful number, since it uses less digits than its factorization.

21849843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902.

The product of its digits is 55296, while the sum is 39.

The square root of 21849843 is about 4674.3815633728. The cubic root of 21849843 is about 279.5649835088.

The spelling of 21849843 in words is "twenty-one million, eight hundred forty-nine thousand, eight hundred forty-three".