21774313 has 6 divisors (see below), whose sum is σ = 23933882. Its totient is φ = 19794720.

The previous prime is 21774289. The next prime is 21774317. The reversal of 21774313 is 31347712.

It can be written as a sum of positive squares in only one way, i.e., 21650409 + 123904 = 4653^2 + 352^2 .

It is not a de Polignac number, because 21774313 - 2⁵ = 21774281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21774317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89856 + ... + 90097.

Almost surely, 2^21774313 is an apocalyptic number.

It is an amenable number.

21774313 is a deficient number, since it is larger than the sum of its proper divisors (2159569).

21774313 is a wasteful number, since it uses less digits than its factorization.

21774313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179975 (or 179964 counting only the distinct ones).

The product of its digits is 3528, while the sum is 28.

The square root of 21774313 is about 4666.2954257098. The cubic root of 21774313 is about 279.2424804958.

The spelling of 21774313 in words is "twenty-one million, seven hundred seventy-four thousand, three hundred thirteen".