21476927 has 2 divisors, whose sum is σ = 21476928. Its totient is φ = 21476926.

The previous prime is 21476921. The next prime is 21476947. The reversal of 21476927 is 72967412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21476927 - 2⁸ = 21476671 is a prime.

It is a super-2 number, since 2×21476927² = 922516786726658, 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 congruent number.

It is not a weakly prime, because it can be changed into another prime (21476921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10738463 + 10738464.

It is an arithmetic number, because the mean of its divisors is an integer number (10738464).

Almost surely, 2^21476927 is an apocalyptic number.

21476927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21476927 is an equidigital number, since it uses as much as digits as its factorization.

21476927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The square root of 21476927 is about 4634.3205542992. The cubic root of 21476927 is about 277.9653830919.

The spelling of 21476927 in words is "twenty-one million, four hundred seventy-six thousand, nine hundred twenty-seven".