21592393 has 2 divisors, whose sum is σ = 21592394. Its totient is φ = 21592392.

The previous prime is 21592387. The next prime is 21592409. The reversal of 21592393 is 39329512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18088009 + 3504384 = 4253^2 + 1872^2 .

It is a cyclic number.

It is not a de Polignac number, because 21592393 - 2²¹ = 19495241 is a prime.

It is not a weakly prime, because it can be changed into another prime (21592313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10796196 + 10796197.

It is an arithmetic number, because the mean of its divisors is an integer number (10796197).

Almost surely, 2^21592393 is an apocalyptic number.

It is an amenable number.

21592393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21592393 is an equidigital number, since it uses as much as digits as its factorization.

21592393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 34.

The square root of 21592393 is about 4646.7615604849. The cubic root of 21592393 is about 278.4626330612.

The spelling of 21592393 in words is "twenty-one million, five hundred ninety-two thousand, three hundred ninety-three".