21773371 has 2 divisors, whose sum is σ = 21773372. Its totient is φ = 21773370.

The previous prime is 21773369. The next prime is 21773383. The reversal of 21773371 is 17337712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21773371 - 2¹ = 21773369 is a prime.

Together with 21773369, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21773321) 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, 10886685 + 10886686.

It is an arithmetic number, because the mean of its divisors is an integer number (10886686).

Almost surely, 2^21773371 is an apocalyptic number.

21773371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21773371 is an equidigital number, since it uses as much as digits as its factorization.

21773371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6174, while the sum is 31.

The square root of 21773371 is about 4666.1944880170. The cubic root of 21773371 is about 279.2384535764.

The spelling of 21773371 in words is "twenty-one million, seven hundred seventy-three thousand, three hundred seventy-one".