521212868929 has 4 divisors (see below), whose sum is σ = 521221955584. Its totient is φ = 521203782276.

The previous prime is 521212868927. The next prime is 521212868963. The reversal of 521212868929 is 929868212125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 521212868929 - 2¹ = 521212868927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521212868929.

It is not an unprimeable number, because it can be changed into a prime (521212868927) 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, 4456737 + ... + 4572190.

It is an arithmetic number, because the mean of its divisors is an integer number (130305488896).

Almost surely, 2^521212868929 is an apocalyptic number.

It is an amenable number.

521212868929 is a deficient number, since it is larger than the sum of its proper divisors (9086655).

521212868929 is an equidigital number, since it uses as much as digits as its factorization.

521212868929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9086654.

The product of its digits is 2488320, while the sum is 55.

The spelling of 521212868929 in words is "five hundred twenty-one billion, two hundred twelve million, eight hundred sixty-eight thousand, nine hundred twenty-nine".