21034193 has 4 divisors (see below), whose sum is σ = 21759540. Its totient is φ = 20308848.

The previous prime is 21034187. The next prime is 21034199. The reversal of 21034193 is 39143012.

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

It is an interprime number because it is at equal distance from previous prime (21034187) and next prime (21034199).

It can be written as a sum of positive squares in 2 ways, for example, as 9690769 + 11343424 = 3113^2 + 3368^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034193 - 2⁶ = 21034129 is a prime.

It is a super-2 number, since 2×21034193² = 884874550322498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362630 + ... + 362687.

It is an arithmetic number, because the mean of its divisors is an integer number (5439885).

Almost surely, 2^21034193 is an apocalyptic number.

It is an amenable number.

21034193 is a deficient number, since it is larger than the sum of its proper divisors (725347).

21034193 is an equidigital number, since it uses as much as digits as its factorization.

21034193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725346.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21034193 is about 4586.3049397091. The cubic root of 21034193 is about 276.0420759559.

The spelling of 21034193 in words is "twenty-one million, thirty-four thousand, one hundred ninety-three".