21773673 has 12 divisors (see below), whose sum is σ = 31491460. Its totient is φ = 14497056.

The previous prime is 21773669. The next prime is 21773683. The reversal of 21773673 is 37637712.

It can be written as a sum of positive squares in 2 ways, for example, as 4359744 + 17413929 = 2088^2 + 4173^2 .

It is not a de Polignac number, because 21773673 - 2² = 21773669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21773603) 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 in 11 ways as a sum of consecutive naturals, for example, 12015 + ... + 13707.

Almost surely, 2^21773673 is an apocalyptic number.

It is an amenable number.

21773673 is a deficient number, since it is larger than the sum of its proper divisors (9717787).

21773673 is a wasteful number, since it uses less digits than its factorization.

21773673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128 (or 3125 counting only the distinct ones).

The product of its digits is 37044, while the sum is 36.

The square root of 21773673 is about 4666.2268483219. The cubic root of 21773673 is about 279.2397445972.

The spelling of 21773673 in words is "twenty-one million, seven hundred seventy-three thousand, six hundred seventy-three".