212312012012121 has 12 divisors (see below), whose sum is σ = 329300263529232. Its totient is φ = 121321149721128.

The previous prime is 212312012012099. The next prime is 212312012012131. The reversal of 212312012012121 is 121210210213212.

It is not a de Polignac number, because 212312012012121 - 2¹⁹ = 212312011487833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (212312012012131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 722149700575 + ... + 722149700868.

It is an arithmetic number, because the mean of its divisors is an integer number (27441688627436).

Almost surely, 2^{212312012012121} is an apocalyptic number.

212312012012121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212312012012121 is a deficient number, since it is larger than the sum of its proper divisors (116988251517111).

212312012012121 is a wasteful number, since it uses less digits than its factorization.

212312012012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444299401460 (or 1444299401453 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 212312012012121 its reverse (121210210213212), we get a palindrome (333522222225333).

The spelling of 212312012012121 in words is "two hundred twelve trillion, three hundred twelve billion, twelve million, twelve thousand, one hundred twenty-one".