21050927 has 2 divisors, whose sum is σ = 21050928. Its totient is φ = 21050926.

The previous prime is 21050923. The next prime is 21050929. The reversal of 21050927 is 72905012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21050927 - 2² = 21050923 is a prime.

Together with 21050929, it forms a pair of twin primes.

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 = 21050896 and 21050905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21050921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525463 + 10525464.

It is an arithmetic number, because the mean of its divisors is an integer number (10525464).

Almost surely, 2^21050927 is an apocalyptic number.

21050927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21050927 is an equidigital number, since it uses as much as digits as its factorization.

21050927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 21050927 is about 4588.1289214668. The cubic root of 21050927 is about 276.1152593937.

Adding to 21050927 its reverse (72905012), we get a palindrome (93955939).

The spelling of 21050927 in words is "twenty-one million, fifty thousand, nine hundred twenty-seven".