211438013 has 2 divisors, whose sum is σ = 211438014. Its totient is φ = 211438012.

The previous prime is 211438001. The next prime is 211438021. The reversal of 211438013 is 310834112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175880644 + 35557369 = 13262^2 + 5963^2 .

It is a cyclic number.

It is not a de Polignac number, because 211438013 - 2¹⁰ = 211436989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211438013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211438033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105719006 + 105719007.

It is an arithmetic number, because the mean of its divisors is an integer number (105719007).

Almost surely, 2^211438013 is an apocalyptic number.

It is an amenable number.

211438013 is a deficient number, since it is larger than the sum of its proper divisors (1).

211438013 is an equidigital number, since it uses as much as digits as its factorization.

211438013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 211438013 is about 14540.9082591150. The cubic root of 211438013 is about 595.7458462101.

The spelling of 211438013 in words is "two hundred eleven million, four hundred thirty-eight thousand, thirteen".