21716773 has 8 divisors (see below), whose sum is σ = 23885568. Its totient is φ = 19619184.

The previous prime is 21716767. The next prime is 21716809. The reversal of 21716773 is 37761712.

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

It is not a de Polignac number, because 21716773 - 2¹³ = 21708581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17161 + ... + 18382.

It is an arithmetic number, because the mean of its divisors is an integer number (2985696).

Almost surely, 2^21716773 is an apocalyptic number.

It is an amenable number.

21716773 is a deficient number, since it is larger than the sum of its proper divisors (2168795).

21716773 is a wasteful number, since it uses less digits than its factorization.

21716773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35603.

The product of its digits is 12348, while the sum is 34.

The square root of 21716773 is about 4660.1258566695. The cubic root of 21716773 is about 278.9962915365.

The spelling of 21716773 in words is "twenty-one million, seven hundred sixteen thousand, seven hundred seventy-three".