21460193 has 4 divisors (see below), whose sum is σ = 21489300. Its totient is φ = 21431088.

The previous prime is 21460181. The next prime is 21460207. The reversal of 21460193 is 39106412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5841889 + 15618304 = 2417^2 + 3952^2 .

It is a cyclic number.

It is not a de Polignac number, because 21460193 - 2⁸ = 21459937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21460123) 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, 13418 + ... + 14931.

It is an arithmetic number, because the mean of its divisors is an integer number (5372325).

Almost surely, 2^21460193 is an apocalyptic number.

It is an amenable number.

21460193 is a deficient number, since it is larger than the sum of its proper divisors (29107).

21460193 is an equidigital number, since it uses as much as digits as its factorization.

21460193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29106.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21460193 is about 4632.5147598254. The cubic root of 21460193 is about 277.8931710024.

The spelling of 21460193 in words is "twenty-one million, four hundred sixty thousand, one hundred ninety-three".