21527873 has 2 divisors, whose sum is σ = 21527874. Its totient is φ = 21527872.

The previous prime is 21527867. The next prime is 21527879. The reversal of 21527873 is 37872512.

It is a balanced prime because it is at equal distance from previous prime (21527867) and next prime (21527879).

It can be written as a sum of positive squares in only one way, i.e., 11075584 + 10452289 = 3328^2 + 3233^2 .

It is a cyclic number.

It is not a de Polignac number, because 21527873 - 2²⁰ = 20479297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21527879) 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 as a sum of consecutive naturals, namely, 10763936 + 10763937.

It is an arithmetic number, because the mean of its divisors is an integer number (10763937).

Almost surely, 2^21527873 is an apocalyptic number.

It is an amenable number.

21527873 is a deficient number, since it is larger than the sum of its proper divisors (1).

21527873 is an equidigital number, since it uses as much as digits as its factorization.

21527873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 35.

The square root of 21527873 is about 4639.8138971299. The cubic root of 21527873 is about 278.1849992678.

The spelling of 21527873 in words is "twenty-one million, five hundred twenty-seven thousand, eight hundred seventy-three".