21461593 has 2 divisors, whose sum is σ = 21461594. Its totient is φ = 21461592.

The previous prime is 21461581. The next prime is 21461611. The reversal of 21461593 is 39516412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19740249 + 1721344 = 4443^2 + 1312^2 .

It is a cyclic number.

It is not a de Polignac number, because 21461593 - 2¹³ = 21453401 is a prime.

It is not a weakly prime, because it can be changed into another prime (21461533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730796 + 10730797.

It is an arithmetic number, because the mean of its divisors is an integer number (10730797).

Almost surely, 2^21461593 is an apocalyptic number.

It is an amenable number.

21461593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21461593 is an equidigital number, since it uses as much as digits as its factorization.

21461593 is an evil number, because the sum of its binary digits is even.

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

The square root of 21461593 is about 4632.6658631937. The cubic root of 21461593 is about 277.8992138493.

The spelling of 21461593 in words is "twenty-one million, four hundred sixty-one thousand, five hundred ninety-three".