211431400073 has 2 divisors, whose sum is σ = 211431400074. Its totient is φ = 211431400072.

The previous prime is 211431400013. The next prime is 211431400091. The reversal of 211431400073 is 370004134112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138352009849 + 73079390224 = 371957^2 + 270332^2 .

It is a cyclic number.

It is not a de Polignac number, because 211431400073 - 2²⁰ = 211430351497 is a prime.

It is not a weakly prime, because it can be changed into another prime (211431400013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105715700036 + 105715700037.

It is an arithmetic number, because the mean of its divisors is an integer number (105715700037).

Almost surely, 2^211431400073 is an apocalyptic number.

It is an amenable number.

211431400073 is a deficient number, since it is larger than the sum of its proper divisors (1).

211431400073 is an equidigital number, since it uses as much as digits as its factorization.

211431400073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 211431400073 its reverse (370004134112), we get a palindrome (581435534185).

The spelling of 211431400073 in words is "two hundred eleven billion, four hundred thirty-one million, four hundred thousand, seventy-three".