21514415451311 has 4 divisors (see below), whose sum is σ = 21514498284624. Its totient is φ = 21514332618000.

The previous prime is 21514415451253. The next prime is 21514415451323. The reversal of 21514415451311 is 11315451441512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21514415451311 - 2¹⁰ = 21514415450287 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 (21514415451391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41025830 + ... + 41546931.

It is an arithmetic number, because the mean of its divisors is an integer number (5378624571156).

Almost surely, 2^{21514415451311} is an apocalyptic number.

21514415451311 is a deficient number, since it is larger than the sum of its proper divisors (82833313).

21514415451311 is an equidigital number, since it uses as much as digits as its factorization.

21514415451311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82833312.

The product of its digits is 48000, while the sum is 38.

Adding to 21514415451311 its reverse (11315451441512), we get a palindrome (32829866892823).

The spelling of 21514415451311 in words is "twenty-one trillion, five hundred fourteen billion, four hundred fifteen million, four hundred fifty-one thousand, three hundred eleven".