212045264561 has 8 divisors (see below), whose sum is σ = 233926108584. Its totient is φ = 190960087680.

The previous prime is 212045264551. The next prime is 212045264573. The reversal of 212045264561 is 165462540212.

It can be written as a sum of positive squares in 4 ways, for example, as 1106227600 + 210939036961 = 33260^2 + 459281^2 .

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-212045264561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212045264551) 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, 198916226 + ... + 198917291.

It is an arithmetic number, because the mean of its divisors is an integer number (29240763573).

Almost surely, 2^212045264561 is an apocalyptic number.

It is an amenable number.

212045264561 is a deficient number, since it is larger than the sum of its proper divisors (21880844023).

212045264561 is a wasteful number, since it uses less digits than its factorization.

212045264561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397833571.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 212045264561 in words is "two hundred twelve billion, forty-five million, two hundred sixty-four thousand, five hundred sixty-one".