21516883 has 8 divisors (see below), whose sum is σ = 23518080. Its totient is φ = 19597440.

The previous prime is 21516877. The next prime is 21516893. The reversal of 21516883 is 38861512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21516883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21516853) 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, 19888 + ... + 20941.

It is an arithmetic number, because the mean of its divisors is an integer number (2939760).

Almost surely, 2^21516883 is an apocalyptic number.

21516883 is a deficient number, since it is larger than the sum of its proper divisors (2001197).

21516883 is a wasteful number, since it uses less digits than its factorization.

21516883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40877.

The product of its digits is 11520, while the sum is 34.

The square root of 21516883 is about 4638.6294312006. The cubic root of 21516883 is about 278.1376533064.

The spelling of 21516883 in words is "twenty-one million, five hundred sixteen thousand, eight hundred eighty-three".