21616026011251 has 32 divisors (see below), whose sum is σ = 25736715878400. Its totient is φ = 17768067206400.

The previous prime is 21616026011249. The next prime is 21616026011273. The reversal of 21616026011251 is 15211062061612.

It is not a de Polignac number, because 21616026011251 - 2¹ = 21616026011249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21616026411251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62183775 + ... + 62530423.

It is an arithmetic number, because the mean of its divisors is an integer number (804272371200).

Almost surely, 2^{21616026011251} is an apocalyptic number.

21616026011251 is a deficient number, since it is larger than the sum of its proper divisors (4120689867149).

21616026011251 is a wasteful number, since it uses less digits than its factorization.

21616026011251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350155.

The product of its (nonzero) digits is 8640, while the sum is 34.

Adding to 21616026011251 its reverse (15211062061612), we get a palindrome (36827088072863).

The spelling of 21616026011251 in words is "twenty-one trillion, six hundred sixteen billion, twenty-six million, eleven thousand, two hundred fifty-one".