521045001244111 has 4 divisors (see below), whose sum is σ = 521448599232424. Its totient is φ = 520641403255800.

The previous prime is 521045001244073. The next prime is 521045001244121. The reversal of 521045001244111 is 111442100540125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521045001244111 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 (521045001244121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201798992220 + ... + 201798994801.

It is an arithmetic number, because the mean of its divisors is an integer number (130362149808106).

Almost surely, 2^{521045001244111} is an apocalyptic number.

521045001244111 is a deficient number, since it is larger than the sum of its proper divisors (403597988313).

521045001244111 is a wasteful number, since it uses less digits than its factorization.

521045001244111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403597988312.

The product of its (nonzero) digits is 6400, while the sum is 31.

Adding to 521045001244111 its reverse (111442100540125), we get a palindrome (632487101784236).

The spelling of 521045001244111 in words is "five hundred twenty-one trillion, forty-five billion, one million, two hundred forty-four thousand, one hundred eleven".