212131204330121 has 4 divisors (see below), whose sum is σ = 212162267626500. Its totient is φ = 212100141033744.

The previous prime is 212131204330069. The next prime is 212131204330169. The reversal of 212131204330121 is 121033402131212.

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 135168991488400 + 76962212841721 = 11626220^2 + 8772811^2 .

It is a cyclic number.

It is not a de Polignac number, because 212131204330121 - 2⁶ = 212131204330057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212131204330021) 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, 15531637946 + ... + 15531651603.

It is an arithmetic number, because the mean of its divisors is an integer number (53040566906625).

Almost surely, 2^{212131204330121} is an apocalyptic number.

It is an amenable number.

212131204330121 is a deficient number, since it is larger than the sum of its proper divisors (31063296379).

212131204330121 is an equidigital number, since it uses as much as digits as its factorization.

212131204330121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31063296378.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 212131204330121 its reverse (121033402131212), we get a palindrome (333164606461333).

The spelling of 212131204330121 in words is "two hundred twelve trillion, one hundred thirty-one billion, two hundred four million, three hundred thirty thousand, one hundred twenty-one".