212516725121 has 4 divisors (see below), whose sum is σ = 212517727572. Its totient is φ = 212515722672.

The previous prime is 212516725111. The next prime is 212516725151. The reversal of 212516725121 is 121527615212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 118104944896 + 94411780225 = 343664^2 + 307265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212516725121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212516725111) 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, 44510 + ... + 653463.

It is an arithmetic number, because the mean of its divisors is an integer number (53129431893).

Almost surely, 2^212516725121 is an apocalyptic number.

It is an amenable number.

212516725121 is a deficient number, since it is larger than the sum of its proper divisors (1002451).

212516725121 is an equidigital number, since it uses as much as digits as its factorization.

212516725121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002450.

The product of its digits is 16800, while the sum is 35.

The spelling of 212516725121 in words is "two hundred twelve billion, five hundred sixteen million, seven hundred twenty-five thousand, one hundred twenty-one".