21516710983 has 8 divisors (see below), whose sum is σ = 21585009600. Its totient is φ = 21448451040.

The previous prime is 21516710927. The next prime is 21516710993. The reversal of 21516710983 is 38901761512.

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-21516710983 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 (21516710993) 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, 1443378 + ... + 1458208.

It is an arithmetic number, because the mean of its divisors is an integer number (2698126200).

Almost surely, 2^21516710983 is an apocalyptic number.

21516710983 is a deficient number, since it is larger than the sum of its proper divisors (68298617).

21516710983 is a wasteful number, since it uses less digits than its factorization.

21516710983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19337.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 21516710983 in words is "twenty-one billion, five hundred sixteen million, seven hundred ten thousand, nine hundred eighty-three".