212221200012121 has 8 divisors (see below), whose sum is σ = 224704941501384. Its totient is φ = 199737474243840.

The previous prime is 212221200012113. The next prime is 212221200012161. The reversal of 212221200012121 is 121210002122212.

It can be written as a sum of positive squares in 4 ways, for example, as 76522255290000 + 135698944722121 = 8747700^2 + 11648989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212221200012121 - 2³ = 212221200012113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212221200012161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34724691 + ... + 40376311.

It is an arithmetic number, because the mean of its divisors is an integer number (28088117687673).

Almost surely, 2^{212221200012121} is an apocalyptic number.

It is an amenable number.

212221200012121 is a deficient number, since it is larger than the sum of its proper divisors (12483741489263).

212221200012121 is a wasteful number, since it uses less digits than its factorization.

212221200012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7860491.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212221200012121 its reverse (121210002122212), we get a palindrome (333431202134333).

The spelling of 212221200012121 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred million, twelve thousand, one hundred twenty-one".