21255221114611 has 4 divisors (see below), whose sum is σ = 23187513943224. Its totient is φ = 19322928286000.

The previous prime is 21255221114597. The next prime is 21255221114627. The reversal of 21255221114611 is 11641112255212.

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 21255221114611 - 2¹¹ = 21255221112563 is a prime.

It is a super-3 number, since 3×21255221114611³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21255221114671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966146414290 + ... + 966146414311.

It is an arithmetic number, because the mean of its divisors is an integer number (5796878485806).

Almost surely, 2^{21255221114611} is an apocalyptic number.

21255221114611 is a deficient number, since it is larger than the sum of its proper divisors (1932292828613).

21255221114611 is a wasteful number, since it uses less digits than its factorization.

21255221114611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932292828612.

The product of its digits is 9600, while the sum is 34.

Adding to 21255221114611 its reverse (11641112255212), we get a palindrome (32896333369823).

The spelling of 21255221114611 in words is "twenty-one trillion, two hundred fifty-five billion, two hundred twenty-one million, one hundred fourteen thousand, six hundred eleven".