211542041 has 4 divisors (see below), whose sum is σ = 211622784. Its totient is φ = 211461300.

The previous prime is 211542031. The next prime is 211542113. The reversal of 211542041 is 140245112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211542041 - 2¹⁸ = 211279897 is a prime.

It is a super-2 number, since 2×211542041² = 89500070220891362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211542031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36305 + ... + 41726.

It is an arithmetic number, because the mean of its divisors is an integer number (52905696).

Almost surely, 2^211542041 is an apocalyptic number.

It is an amenable number.

211542041 is a deficient number, since it is larger than the sum of its proper divisors (80743).

211542041 is an equidigital number, since it uses as much as digits as its factorization.

211542041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80742.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 211542041 is about 14544.4848997825. The cubic root of 211542041 is about 595.8435329773.

Adding to 211542041 its reverse (140245112), we get a palindrome (351787153).

The spelling of 211542041 in words is "two hundred eleven million, five hundred forty-two thousand, forty-one".