21516741283 has 2 divisors, whose sum is σ = 21516741284. Its totient is φ = 21516741282.

The previous prime is 21516741269. The next prime is 21516741287. The reversal of 21516741283 is 38214761512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21516741283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21516741287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10758370641 + 10758370642.

It is an arithmetic number, because the mean of its divisors is an integer number (10758370642).

Almost surely, 2^21516741283 is an apocalyptic number.

21516741283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21516741283 is an equidigital number, since it uses as much as digits as its factorization.

21516741283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The spelling of 21516741283 in words is "twenty-one billion, five hundred sixteen million, seven hundred forty-one thousand, two hundred eighty-three".