21674347 has 2 divisors, whose sum is σ = 21674348. Its totient is φ = 21674346.

The previous prime is 21674333. The next prime is 21674351. The reversal of 21674347 is 74347612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21674347 - 2¹⁵ = 21641579 is a prime.

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

It is equal to p_1369906 and since 21674347 and 1369906 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21674327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837173 + 10837174.

It is an arithmetic number, because the mean of its divisors is an integer number (10837174).

Almost surely, 2^21674347 is an apocalyptic number.

21674347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21674347 is an equidigital number, since it uses as much as digits as its factorization.

21674347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 34.

The square root of 21674347 is about 4655.5716082990. The cubic root of 21674347 is about 278.8144902300.

The spelling of 21674347 in words is "twenty-one million, six hundred seventy-four thousand, three hundred forty-seven".