212444534521 has 4 divisors (see below), whose sum is σ = 213995224692. Its totient is φ = 210893844352.

The previous prime is 212444534509. The next prime is 212444534527. The reversal of 212444534521 is 125435444212.

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 163543404025 + 48901130496 = 404405^2 + 221136^2 .

It is a cyclic number.

It is not a de Polignac number, because 212444534521 - 2⁹ = 212444534009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212444534527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775344880 + ... + 775345153.

It is an arithmetic number, because the mean of its divisors is an integer number (53498806173).

Almost surely, 2^212444534521 is an apocalyptic number.

It is an amenable number.

212444534521 is a deficient number, since it is larger than the sum of its proper divisors (1550690171).

212444534521 is a wasteful number, since it uses less digits than its factorization.

212444534521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550690170.

The product of its digits is 153600, while the sum is 37.

Adding to 212444534521 its reverse (125435444212), we get a palindrome (337879978733).

The spelling of 212444534521 in words is "two hundred twelve billion, four hundred forty-four million, five hundred thirty-four thousand, five hundred twenty-one".