512136056634221 has 4 divisors (see below), whose sum is σ = 512769104912700. Its totient is φ = 511503008355744.

The previous prime is 512136056634211. The next prime is 512136056634227. The reversal of 512136056634221 is 122436650631215.

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 384848268002500 + 127287788631721 = 19617550^2 + 11282189^2 .

It is a cyclic number.

It is not a de Polignac number, because 512136056634221 - 2³⁸ = 511861178727277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512136056634227) 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, 316524138026 + ... + 316524139643.

It is an arithmetic number, because the mean of its divisors is an integer number (128192276228175).

Almost surely, 2^{512136056634221} is an apocalyptic number.

It is an amenable number.

512136056634221 is a deficient number, since it is larger than the sum of its proper divisors (633048278479).

512136056634221 is an equidigital number, since it uses as much as digits as its factorization.

512136056634221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633048278478.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 512136056634221 in words is "five hundred twelve trillion, one hundred thirty-six billion, fifty-six million, six hundred thirty-four thousand, two hundred twenty-one".