21004032211 has 4 divisors (see below), whose sum is σ = 21018216024. Its totient is φ = 20989848400.

The previous prime is 21004032209. The next prime is 21004032221. The reversal of 21004032211 is 11223040012.

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 21004032211 - 2¹ = 21004032209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004032221) 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, 7089685 + ... + 7092646.

It is an arithmetic number, because the mean of its divisors is an integer number (5254554006).

Almost surely, 2^21004032211 is an apocalyptic number.

21004032211 is a deficient number, since it is larger than the sum of its proper divisors (14183813).

21004032211 is a wasteful number, since it uses less digits than its factorization.

21004032211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14183812.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21004032211 its reverse (11223040012), we get a palindrome (32227072223).

The spelling of 21004032211 in words is "twenty-one billion, four million, thirty-two thousand, two hundred eleven".