212123040042043 has 4 divisors (see below), whose sum is σ = 228440196968368. Its totient is φ = 195805883115720.

The previous prime is 212123040042041. The next prime is 212123040042049. The reversal of 212123040042043 is 340240040321212.

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

It is a cyclic number.

It is not a de Polignac number, because 212123040042043 - 2¹ = 212123040042041 is a prime.

It is a super-2 number, since 2×212123040042043² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212123040042041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8158578463143 + ... + 8158578463168.

It is an arithmetic number, because the mean of its divisors is an integer number (57110049242092).

Almost surely, 2^{212123040042043} is an apocalyptic number.

212123040042043 is a deficient number, since it is larger than the sum of its proper divisors (16317156926325).

212123040042043 is a wasteful number, since it uses less digits than its factorization.

212123040042043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16317156926324.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 212123040042043 its reverse (340240040321212), we get a palindrome (552363080363255).

The spelling of 212123040042043 in words is "two hundred twelve trillion, one hundred twenty-three billion, forty million, forty-two thousand, forty-three".