212123131012 has 48 divisors (see below), whose sum is σ = 423448588080. Its totient is φ = 92108685312.

The previous prime is 212123131001. The next prime is 212123131013. The reversal of 212123131012 is 210131321212.

It can be written as a sum of positive squares in 8 ways, for example, as 26563784256 + 185559346756 = 162984^2 + 430766^2 .

It is a super-2 number, since 2×212123131012² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212123131013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2332458 + ... + 2421694.

It is an arithmetic number, because the mean of its divisors is an integer number (8821845585).

Almost surely, 2^212123131012 is an apocalyptic number.

It is an amenable number.

212123131012 is a deficient number, since it is larger than the sum of its proper divisors (211325457068).

212123131012 is a wasteful number, since it uses less digits than its factorization.

212123131012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91960 (or 91958 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 212123131012 its reverse (210131321212), we get a palindrome (422254452224).

The spelling of 212123131012 in words is "two hundred twelve billion, one hundred twenty-three million, one hundred thirty-one thousand, twelve".