21403312211 has 2 divisors, whose sum is σ = 21403312212. Its totient is φ = 21403312210.

The previous prime is 21403312181. The next prime is 21403312243. The reversal of 21403312211 is 11221330412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21403312211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21403315211) 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 as a sum of consecutive naturals, namely, 10701656105 + 10701656106.

It is an arithmetic number, because the mean of its divisors is an integer number (10701656106).

Almost surely, 2^21403312211 is an apocalyptic number.

21403312211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403312211 is an equidigital number, since it uses as much as digits as its factorization.

21403312211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21403312211 its reverse (11221330412), we get a palindrome (32624642623).

The spelling of 21403312211 in words is "twenty-one billion, four hundred three million, three hundred twelve thousand, two hundred eleven".