21276347 has 2 divisors, whose sum is σ = 21276348. Its totient is φ = 21276346.

The previous prime is 21276337. The next prime is 21276377. The reversal of 21276347 is 74367212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21276347 - 2⁴ = 21276331 is a prime.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (21276317) 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, 10638173 + 10638174.

It is an arithmetic number, because the mean of its divisors is an integer number (10638174).

Almost surely, 2^21276347 is an apocalyptic number.

21276347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21276347 is an equidigital number, since it uses as much as digits as its factorization.

21276347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 32.

The square root of 21276347 is about 4612.6290767847. The cubic root of 21276347 is about 277.0973387962.

The spelling of 21276347 in words is "twenty-one million, two hundred seventy-six thousand, three hundred forty-seven".