21832513 has 2 divisors, whose sum is σ = 21832514. Its totient is φ = 21832512.

The previous prime is 21832477. The next prime is 21832529. The reversal of 21832513 is 31523812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14799409 + 7033104 = 3847^2 + 2652^2 .

It is a cyclic number.

It is not a de Polignac number, because 21832513 - 2¹⁷ = 21701441 is a prime.

It is not a weakly prime, because it can be changed into another prime (21832813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10916256 + 10916257.

It is an arithmetic number, because the mean of its divisors is an integer number (10916257).

Almost surely, 2^21832513 is an apocalyptic number.

It is an amenable number.

21832513 is a deficient number, since it is larger than the sum of its proper divisors (1).

21832513 is an equidigital number, since it uses as much as digits as its factorization.

21832513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 21832513 is about 4672.5274745046. The cubic root of 21832513 is about 279.4910525029.

The spelling of 21832513 in words is "twenty-one million, eight hundred thirty-two thousand, five hundred thirteen".