211242461 has 4 divisors (see below), whose sum is σ = 211288512. Its totient is φ = 211196412.

The previous prime is 211242407. The next prime is 211242469. The reversal of 211242461 is 164242112.

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 211242461 - 2⁶ = 211242397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211242469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15275 + ... + 25608.

It is an arithmetic number, because the mean of its divisors is an integer number (52822128).

Almost surely, 2^211242461 is an apocalyptic number.

It is an amenable number.

211242461 is a deficient number, since it is larger than the sum of its proper divisors (46051).

211242461 is an equidigital number, since it uses as much as digits as its factorization.

211242461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46050.

The product of its digits is 768, while the sum is 23.

The square root of 211242461 is about 14534.1825019504. The cubic root of 211242461 is about 595.5621277072.

Adding to 211242461 its reverse (164242112), we get a palindrome (375484573).

The spelling of 211242461 in words is "two hundred eleven million, two hundred forty-two thousand, four hundred sixty-one".