21230927 has 2 divisors, whose sum is σ = 21230928. Its totient is φ = 21230926.

The previous prime is 21230921. The next prime is 21230941. The reversal of 21230927 is 72903212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230927 - 2¹² = 21226831 is a prime.

It is a super-2 number, since 2×21230927² = 901504522558658, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21230896 and 21230905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615463 + 10615464.

It is an arithmetic number, because the mean of its divisors is an integer number (10615464).

Almost surely, 2^21230927 is an apocalyptic number.

21230927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230927 is an equidigital number, since it uses as much as digits as its factorization.

21230927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21230927 is about 4607.7030069222. The cubic root of 21230927 is about 276.9000190896.

The spelling of 21230927 in words is "twenty-one million, two hundred thirty thousand, nine hundred twenty-seven".