211321423 has 2 divisors, whose sum is σ = 211321424. Its totient is φ = 211321422.

The previous prime is 211321381. The next prime is 211321427. The reversal of 211321423 is 324123112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211321423 - 2¹⁷ = 211190351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211321423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211321427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105660711 + 105660712.

It is an arithmetic number, because the mean of its divisors is an integer number (105660712).

Almost surely, 2^211321423 is an apocalyptic number.

211321423 is a deficient number, since it is larger than the sum of its proper divisors (1).

211321423 is an equidigital number, since it uses as much as digits as its factorization.

211321423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 211321423 is about 14536.8986720002. The cubic root of 211321423 is about 595.6363250982.

Adding to 211321423 its reverse (324123112), we get a palindrome (535444535).

The spelling of 211321423 in words is "two hundred eleven million, three hundred twenty-one thousand, four hundred twenty-three".