212051510256161 has 8 divisors (see below), whose sum is σ = 213333471359400. Its totient is φ = 210770195473152.

The previous prime is 212051510256109. The next prime is 212051510256191. The reversal of 212051510256161 is 161652015150212.

It can be written as a sum of positive squares in 4 ways, for example, as 66572789416225 + 145478720839936 = 8159215^2 + 12061456^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212051510256161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212051510256191) 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, 160921886 + ... + 162234263.

It is an arithmetic number, because the mean of its divisors is an integer number (26666683919925).

Almost surely, 2^{212051510256161} is an apocalyptic number.

It is an amenable number.

212051510256161 is a deficient number, since it is larger than the sum of its proper divisors (1281961103239).

212051510256161 is a wasteful number, since it uses less digits than its factorization.

212051510256161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323160115.

The product of its (nonzero) digits is 36000, while the sum is 38.

The spelling of 212051510256161 in words is "two hundred twelve trillion, fifty-one billion, five hundred ten million, two hundred fifty-six thousand, one hundred sixty-one".