211624231421 has 2 divisors, whose sum is σ = 211624231422. Its totient is φ = 211624231420.

The previous prime is 211624231411. The next prime is 211624231447. The reversal of 211624231421 is 124132426112.

It is a happy number.

211624231421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194493348196 + 17130883225 = 441014^2 + 130885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211624231421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211624231411) 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, 105812115710 + 105812115711.

It is an arithmetic number, because the mean of its divisors is an integer number (105812115711).

Almost surely, 2^211624231421 is an apocalyptic number.

It is an amenable number.

211624231421 is a deficient number, since it is larger than the sum of its proper divisors (1).

211624231421 is an equidigital number, since it uses as much as digits as its factorization.

211624231421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 29.

Adding to 211624231421 its reverse (124132426112), we get a palindrome (335756657533).

The spelling of 211624231421 in words is "two hundred eleven billion, six hundred twenty-four million, two hundred thirty-one thousand, four hundred twenty-one".