21741593 has 2 divisors, whose sum is σ = 21741594. Its totient is φ = 21741592.

The previous prime is 21741583. The next prime is 21741613. The reversal of 21741593 is 39514712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21641104 + 100489 = 4652^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 21741593 - 2⁸ = 21741337 is a prime.

It is not a weakly prime, because it can be changed into another prime (21741523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10870796 + 10870797.

It is an arithmetic number, because the mean of its divisors is an integer number (10870797).

Almost surely, 2^21741593 is an apocalyptic number.

It is an amenable number.

21741593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21741593 is an equidigital number, since it uses as much as digits as its factorization.

21741593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 21741593 is about 4662.7881144225. The cubic root of 21741593 is about 279.1025389298.

The spelling of 21741593 in words is "twenty-one million, seven hundred forty-one thousand, five hundred ninety-three".