521011135421 has 4 divisors (see below), whose sum is σ = 595441297632. Its totient is φ = 446580973212.

The previous prime is 521011135397. The next prime is 521011135507. The reversal of 521011135421 is 124531110125.

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 a de Polignac number, because none of the positive numbers 2^k-521011135421 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 (521011135121) 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, 37215081095 + ... + 37215081108.

It is an arithmetic number, because the mean of its divisors is an integer number (148860324408).

Almost surely, 2^521011135421 is an apocalyptic number.

It is an amenable number.

521011135421 is a deficient number, since it is larger than the sum of its proper divisors (74430162211).

521011135421 is an equidigital number, since it uses as much as digits as its factorization.

521011135421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74430162210.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 521011135421 its reverse (124531110125), we get a palindrome (645542245546).

The spelling of 521011135421 in words is "five hundred twenty-one billion, eleven million, one hundred thirty-five thousand, four hundred twenty-one".