21175073 has 2 divisors, whose sum is σ = 21175074. Its totient is φ = 21175072.

The previous prime is 21175067. The next prime is 21175079. The reversal of 21175073 is 37057112.

It is a balanced prime because it is at equal distance from previous prime (21175067) and next prime (21175079).

It can be written as a sum of positive squares in only one way, i.e., 17909824 + 3265249 = 4232^2 + 1807^2 .

It is a cyclic number.

It is not a de Polignac number, because 21175073 - 2²⁰ = 20126497 is a prime.

It is not a weakly prime, because it can be changed into another prime (21175079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10587536 + 10587537.

It is an arithmetic number, because the mean of its divisors is an integer number (10587537).

Almost surely, 2^21175073 is an apocalyptic number.

It is an amenable number.

21175073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21175073 is an equidigital number, since it uses as much as digits as its factorization.

21175073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 21175073 is about 4601.6380779023. The cubic root of 21175073 is about 276.6569843872.

The spelling of 21175073 in words is "twenty-one million, one hundred seventy-five thousand, seventy-three".