21030716116251 has 24 divisors (see below), whose sum is σ = 31678794463680. Its totient is φ = 13942150692552.

The previous prime is 21030716116247. The next prime is 21030716116313. The reversal of 21030716116251 is 15261161703012.

21030716116251 is a `hidden beast` number, since 2 + 1 + 0 + 3 + 0 + 7 + 16 + 11 + 625 + 1 = 666.

It is not a de Polignac number, because 21030716116251 - 2² = 21030716116247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21030716116451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241705545 + ... + 241792538.

It is an arithmetic number, because the mean of its divisors is an integer number (1319949769320).

Almost surely, 2^{21030716116251} is an apocalyptic number.

21030716116251 is a deficient number, since it is larger than the sum of its proper divisors (10648078347429).

21030716116251 is an equidigital number, since it uses as much as digits as its factorization.

21030716116251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483498277 (or 483498265 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

Adding to 21030716116251 its reverse (15261161703012), we get a palindrome (36291877819263).

The spelling of 21030716116251 in words is "twenty-one trillion, thirty billion, seven hundred sixteen million, one hundred sixteen thousand, two hundred fifty-one".