21734327 has 2 divisors, whose sum is σ = 21734328. Its totient is φ = 21734326.

The previous prime is 21734303. The next prime is 21734329. The reversal of 21734327 is 72343712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21734327 - 2⁶ = 21734263 is a prime.

Together with 21734329, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21734327.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21734329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10867163 + 10867164.

It is an arithmetic number, because the mean of its divisors is an integer number (10867164).

Almost surely, 2^21734327 is an apocalyptic number.

21734327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21734327 is an equidigital number, since it uses as much as digits as its factorization.

21734327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 29.

The square root of 21734327 is about 4662.0089017504. The cubic root of 21734327 is about 279.0714436155.

The spelling of 21734327 in words is "twenty-one million, seven hundred thirty-four thousand, three hundred twenty-seven".