21484843 has 2 divisors, whose sum is σ = 21484844. Its totient is φ = 21484842.

The previous prime is 21484831. The next prime is 21484913. The reversal of 21484843 is 34848412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21484843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21484799 and 21484808.

It is not a weakly prime, because it can be changed into another prime (21484343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742421 + 10742422.

It is an arithmetic number, because the mean of its divisors is an integer number (10742422).

Almost surely, 2^21484843 is an apocalyptic number.

21484843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21484843 is an equidigital number, since it uses as much as digits as its factorization.

21484843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 34.

The square root of 21484843 is about 4635.1745382456. The cubic root of 21484843 is about 277.9995298717. Note that the first 3 decimals are identical.

The spelling of 21484843 in words is "twenty-one million, four hundred eighty-four thousand, eight hundred forty-three".