21473267 has 2 divisors, whose sum is σ = 21473268. Its totient is φ = 21473266.

The previous prime is 21473239. The next prime is 21473269. The reversal of 21473267 is 76237412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21473267 is a prime.

It is a super-2 number, since 2×21473267² = 922202391306578, which contains 22 as substring.

Together with 21473269, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21473269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10736633 + 10736634.

It is an arithmetic number, because the mean of its divisors is an integer number (10736634).

Almost surely, 2^21473267 is an apocalyptic number.

21473267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21473267 is an equidigital number, since it uses as much as digits as its factorization.

21473267 is an evil number, because the sum of its binary digits is even.

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

The square root of 21473267 is about 4633.9256575823. The cubic root of 21473267 is about 277.9495923304.

The spelling of 21473267 in words is "twenty-one million, four hundred seventy-three thousand, two hundred sixty-seven".