211043081 has 2 divisors, whose sum is σ = 211043082. Its totient is φ = 211043080.

The previous prime is 211042987. The next prime is 211043087. The reversal of 211043081 is 180340112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207821056 + 3222025 = 14416^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 211043081 - 2¹⁰ = 211042057 is a prime.

It is a super-2 number, since 2×211043081² = 89078364075945122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211043087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105521540 + 105521541.

It is an arithmetic number, because the mean of its divisors is an integer number (105521541).

Almost surely, 2^211043081 is an apocalyptic number.

It is an amenable number.

211043081 is a deficient number, since it is larger than the sum of its proper divisors (1).

211043081 is an equidigital number, since it uses as much as digits as its factorization.

211043081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 211043081 is about 14527.3218798235. The cubic root of 211043081 is about 595.3746960794.

Adding to 211043081 its reverse (180340112), we get a palindrome (391383193).

The spelling of 211043081 in words is "two hundred eleven million, forty-three thousand, eighty-one".