212312202222121 has 16 divisors (see below), whose sum is σ = 217022675627520. Its totient is φ = 207609802260480.

The previous prime is 212312202222073. The next prime is 212312202222217. The reversal of 212312202222121 is 121222202213212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212312202222121 - 2²³ = 212312193833513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212312202222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 878513020 + ... + 878754658.

It is an arithmetic number, because the mean of its divisors is an integer number (13563917226720).

Almost surely, 2^{212312202222121} is an apocalyptic number.

It is an amenable number.

212312202222121 is a deficient number, since it is larger than the sum of its proper divisors (4710473405399).

212312202222121 is a wasteful number, since it uses less digits than its factorization.

212312202222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258264.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 212312202222121 its reverse (121222202213212), we get a palindrome (333534404435333).

The spelling of 212312202222121 in words is "two hundred twelve trillion, three hundred twelve billion, two hundred two million, two hundred twenty-two thousand, one hundred twenty-one".