21853093 has 2 divisors, whose sum is σ = 21853094. Its totient is φ = 21853092.

The previous prime is 21853079. The next prime is 21853103. The reversal of 21853093 is 39035812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17455684 + 4397409 = 4178^2 + 2097^2 .

It is a cyclic number.

It is not a de Polignac number, because 21853093 - 2¹⁷ = 21722021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21853043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10926546 + 10926547.

It is an arithmetic number, because the mean of its divisors is an integer number (10926547).

Almost surely, 2^21853093 is an apocalyptic number.

It is an amenable number.

21853093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21853093 is an equidigital number, since it uses as much as digits as its factorization.

21853093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 21853093 is about 4674.7291900173. The cubic root of 21853093 is about 279.5788438853.

The spelling of 21853093 in words is "twenty-one million, eight hundred fifty-three thousand, ninety-three".