211240399 has 2 divisors, whose sum is σ = 211240400. Its totient is φ = 211240398.

The previous prime is 211240387. The next prime is 211240409. The reversal of 211240399 is 993042112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211240399 - 2⁹ = 211239887 is a prime.

It is equal to p_11666182 and since 211240399 and 11666182 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211240399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211240369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105620199 + 105620200.

It is an arithmetic number, because the mean of its divisors is an integer number (105620200).

Almost surely, 2^211240399 is an apocalyptic number.

211240399 is a deficient number, since it is larger than the sum of its proper divisors (1).

211240399 is an equidigital number, since it uses as much as digits as its factorization.

211240399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 211240399 is about 14534.1115655550. Note that the first 3 decimals coincide. The cubic root of 211240399 is about 595.5601898816.

The spelling of 211240399 in words is "two hundred eleven million, two hundred forty thousand, three hundred ninety-nine".