212011120212121 has 4 divisors (see below), whose sum is σ = 212734707653412. Its totient is φ = 211287532770832.

The previous prime is 212011120212091. The next prime is 212011120212137. The reversal of 212011120212121 is 121212021110212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 166747221868096 + 45263898344025 = 12913064^2 + 6727845^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011120212121 - 2²⁷ = 212010985994393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212011120212161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361793720206 + ... + 361793720791.

It is an arithmetic number, because the mean of its divisors is an integer number (53183676913353).

Almost surely, 2^{212011120212121} is an apocalyptic number.

It is an amenable number.

212011120212121 is a deficient number, since it is larger than the sum of its proper divisors (723587441291).

212011120212121 is an equidigital number, since it uses as much as digits as its factorization.

212011120212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723587441290.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212011120212121 its reverse (121212021110212), we get a palindrome (333223141322333).

The spelling of 212011120212121 in words is "two hundred twelve trillion, eleven billion, one hundred twenty million, two hundred twelve thousand, one hundred twenty-one".