21845377 has 8 divisors (see below), whose sum is σ = 22844160. Its totient is φ = 20850720.

The previous prime is 21845353. The next prime is 21845387. The reversal of 21845377 is 77354812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21845377 - 2⁷ = 21845249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21845387) 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 in 7 ways as a sum of consecutive naturals, for example, 15877 + ... + 17197.

It is an arithmetic number, because the mean of its divisors is an integer number (2855520).

Almost surely, 2^21845377 is an apocalyptic number.

It is an amenable number.

21845377 is a deficient number, since it is larger than the sum of its proper divisors (998783).

21845377 is a wasteful number, since it uses less digits than its factorization.

21845377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063.

The product of its digits is 47040, while the sum is 37.

The square root of 21845377 is about 4673.9038287068. The cubic root of 21845377 is about 279.5459349770.

It can be divided in two parts, 21845 and 377, that added together give a palindrome (22222).

The spelling of 21845377 in words is "twenty-one million, eight hundred forty-five thousand, three hundred seventy-seven".