211242212845 has 4 divisors (see below), whose sum is σ = 253490655420. Its totient is φ = 168993770272.

The previous prime is 211242212803. The next prime is 211242212887. The reversal of 211242212845 is 548212242112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (211242212803) and next prime (211242212887).

It can be written as a sum of positive squares in 2 ways, for example, as 70344831076 + 140897381769 = 265226^2 + 375363^2 .

It is a cyclic number.

It is not a de Polignac number, because 211242212845 - 2¹³ = 211242204653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211242212845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21124221280 + ... + 21124221289.

It is an arithmetic number, because the mean of its divisors is an integer number (63372663855).

Almost surely, 2^211242212845 is an apocalyptic number.

It is an amenable number.

211242212845 is a deficient number, since it is larger than the sum of its proper divisors (42248442575).

211242212845 is an equidigital number, since it uses as much as digits as its factorization.

211242212845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42248442574.

The product of its digits is 20480, while the sum is 34.

Adding to 211242212845 its reverse (548212242112), we get a palindrome (759454454957).

The spelling of 211242212845 in words is "two hundred eleven billion, two hundred forty-two million, two hundred twelve thousand, eight hundred forty-five".