21020927 has 2 divisors, whose sum is σ = 21020928. Its totient is φ = 21020926.

The previous prime is 21020917. The next prime is 21020941. The reversal of 21020927 is 72902012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020927 - 2⁶ = 21020863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510463 + 10510464.

It is an arithmetic number, because the mean of its divisors is an integer number (10510464).

Almost surely, 2^21020927 is an apocalyptic number.

21020927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020927 is an equidigital number, since it uses as much as digits as its factorization.

21020927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 21020927 is about 4584.8584492872. The cubic root of 21020927 is about 275.9840316673.

Adding to 21020927 its reverse (72902012), we get a palindrome (93922939).

The spelling of 21020927 in words is "twenty-one million, twenty thousand, nine hundred twenty-seven".