21792571 has 2 divisors, whose sum is σ = 21792572. Its totient is φ = 21792570.

The previous prime is 21792557. The next prime is 21792577. The reversal of 21792571 is 17529712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21792571 - 2⁵ = 21792539 is a prime.

It is not a weakly prime, because it can be changed into another prime (21792577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10896285 + 10896286.

It is an arithmetic number, because the mean of its divisors is an integer number (10896286).

Almost surely, 2^21792571 is an apocalyptic number.

21792571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21792571 is an equidigital number, since it uses as much as digits as its factorization.

21792571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 34.

The square root of 21792571 is about 4668.2513856904. The cubic root of 21792571 is about 279.3205079840.

The spelling of 21792571 in words is "twenty-one million, seven hundred ninety-two thousand, five hundred seventy-one".