21716083 has 4 divisors (see below), whose sum is σ = 21854560. Its totient is φ = 21577608.

The previous prime is 21716081. The next prime is 21716087. The reversal of 21716083 is 38061712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21716083 - 2¹ = 21716081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21716081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69003 + ... + 69316.

It is an arithmetic number, because the mean of its divisors is an integer number (5463640).

Almost surely, 2^21716083 is an apocalyptic number.

21716083 is a deficient number, since it is larger than the sum of its proper divisors (138477).

21716083 is a wasteful number, since it uses less digits than its factorization.

21716083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138476.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21716083 is about 4660.0518237462. The cubic root of 21716083 is about 278.9933366856.

Adding to 21716083 its reverse (38061712), we get a palindrome (59777795).

The spelling of 21716083 in words is "twenty-one million, seven hundred sixteen thousand, eighty-three".