21213402211 has 2 divisors, whose sum is σ = 21213402212. Its totient is φ = 21213402210.

The previous prime is 21213402209. The next prime is 21213402229. The reversal of 21213402211 is 11220431212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213402211 - 2¹ = 21213402209 is a prime.

Together with 21213402209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21213402271) 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 as a sum of consecutive naturals, namely, 10606701105 + 10606701106.

It is an arithmetic number, because the mean of its divisors is an integer number (10606701106).

Almost surely, 2^21213402211 is an apocalyptic number.

21213402211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213402211 is an equidigital number, since it uses as much as digits as its factorization.

21213402211 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21213402211 its reverse (11220431212), we get a palindrome (32433833423).

The spelling of 21213402211 in words is "twenty-one billion, two hundred thirteen million, four hundred two thousand, two hundred eleven".