212125431105 has 24 divisors (see below), whose sum is σ = 420210378432. Its totient is φ = 96971625504.

The previous prime is 212125431103. The next prime is 212125431121. The reversal of 212125431105 is 501134521212.

It is a happy number.

212125431105 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 2 + 543 + 110 + 5 = 666.

It is not a de Polignac number, because 212125431105 - 2¹ = 212125431103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212125431103) 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 23 ways as a sum of consecutive naturals, for example, 336706719 + ... + 336707348.

It is an arithmetic number, because the mean of its divisors is an integer number (17508765768).

Almost surely, 2^212125431105 is an apocalyptic number.

It is an amenable number.

212125431105 is a deficient number, since it is larger than the sum of its proper divisors (208084947327).

212125431105 is a wasteful number, since it uses less digits than its factorization.

212125431105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673414085 (or 673414082 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 212125431105 its reverse (501134521212), we get a palindrome (713259952317).

The spelling of 212125431105 in words is "two hundred twelve billion, one hundred twenty-five million, four hundred thirty-one thousand, one hundred five".