21004134211 has 16 divisors (see below), whose sum is σ = 21804117280. Its totient is φ = 20216977920.

The previous prime is 21004134163. The next prime is 21004134233. The reversal of 21004134211 is 11243140012.

It is a cyclic number.

It is not a de Polignac number, because 21004134211 - 2¹³ = 21004126019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004134271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2783035 + ... + 2790571.

It is an arithmetic number, because the mean of its divisors is an integer number (1362757330).

Almost surely, 2^21004134211 is an apocalyptic number.

21004134211 is a deficient number, since it is larger than the sum of its proper divisors (799983069).

21004134211 is a wasteful number, since it uses less digits than its factorization.

21004134211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8374.

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

Adding to 21004134211 its reverse (11243140012), we get a palindrome (32247274223).

The spelling of 21004134211 in words is "twenty-one billion, four million, one hundred thirty-four thousand, two hundred eleven".