21511115341 has 4 divisors (see below), whose sum is σ = 21832176832. Its totient is φ = 21190053852.

The previous prime is 21511115323. The next prime is 21511115453. The reversal of 21511115341 is 14351111512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21511115341 - 2¹¹ = 21511113293 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 (21511118341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160530645 + ... + 160530778.

It is an arithmetic number, because the mean of its divisors is an integer number (5458044208).

Almost surely, 2^21511115341 is an apocalyptic number.

It is an amenable number.

21511115341 is a deficient number, since it is larger than the sum of its proper divisors (321061491).

21511115341 is an equidigital number, since it uses as much as digits as its factorization.

21511115341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321061490.

The product of its digits is 600, while the sum is 25.

Adding to 21511115341 its reverse (14351111512), we get a palindrome (35862226853).

It can be divided in two parts, 215 and 11115341, that added together give a square (11115556 = 3334²).

The spelling of 21511115341 in words is "twenty-one billion, five hundred eleven million, one hundred fifteen thousand, three hundred forty-one".