21374611 has 2 divisors, whose sum is σ = 21374612. Its totient is φ = 21374610.

The previous prime is 21374609. The next prime is 21374657. The reversal of 21374611 is 11647312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21374611 - 2¹ = 21374609 is a prime.

Together with 21374609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21374011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687305 + 10687306.

It is an arithmetic number, because the mean of its divisors is an integer number (10687306).

Almost surely, 2^21374611 is an apocalyptic number.

21374611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374611 is an equidigital number, since it uses as much as digits as its factorization.

21374611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 21374611 is about 4623.2684326134. The cubic root of 21374611 is about 277.5232715922.

The spelling of 21374611 in words is "twenty-one million, three hundred seventy-four thousand, six hundred eleven".