21404332211 has 8 divisors (see below), whose sum is σ = 21468117504. Its totient is φ = 21340617480.

The previous prime is 21404332153. The next prime is 21404332217. The reversal of 21404332211 is 11223340412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21404332211 - 2¹⁸ = 21404070067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404332217) 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 7 ways as a sum of consecutive naturals, for example, 624326 + ... + 657716.

It is an arithmetic number, because the mean of its divisors is an integer number (2683514688).

Almost surely, 2^21404332211 is an apocalyptic number.

21404332211 is a deficient number, since it is larger than the sum of its proper divisors (63785293).

21404332211 is a wasteful number, since it uses less digits than its factorization.

21404332211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35281.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21404332211 its reverse (11223340412), we get a palindrome (32627672623).

The spelling of 21404332211 in words is "twenty-one billion, four hundred four million, three hundred thirty-two thousand, two hundred eleven".