21204341011 has 4 divisors (see below), whose sum is σ = 24233532592. Its totient is φ = 18175149432.

The previous prime is 21204341003. The next prime is 21204341021. The reversal of 21204341011 is 11014340212.

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 21204341011 - 2³ = 21204341003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21204341011.

It is not an unprimeable number, because it can be changed into a prime (21204341021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514595780 + ... + 1514595793.

It is an arithmetic number, because the mean of its divisors is an integer number (6058383148).

Almost surely, 2^21204341011 is an apocalyptic number.

21204341011 is a deficient number, since it is larger than the sum of its proper divisors (3029191581).

21204341011 is an equidigital number, since it uses as much as digits as its factorization.

21204341011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029191580.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21204341011 its reverse (11014340212), we get a palindrome (32218681223).

The spelling of 21204341011 in words is "twenty-one billion, two hundred four million, three hundred forty-one thousand, eleven".