521043224421 has 16 divisors (see below), whose sum is σ = 695366317568. Its totient is φ = 347041292400.

The previous prime is 521043224417. The next prime is 521043224423. The reversal of 521043224421 is 124422340125.

It is a happy number.

It is not a de Polignac number, because 521043224421 - 2² = 521043224417 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 (521043224423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15615726 + ... + 15649056.

It is an arithmetic number, because the mean of its divisors is an integer number (43460394848).

Almost surely, 2^521043224421 is an apocalyptic number.

It is an amenable number.

521043224421 is a deficient number, since it is larger than the sum of its proper divisors (174323093147).

521043224421 is a wasteful number, since it uses less digits than its factorization.

521043224421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37992.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 521043224421 its reverse (124422340125), we get a palindrome (645465564546).

The spelling of 521043224421 in words is "five hundred twenty-one billion, forty-three million, two hundred twenty-four thousand, four hundred twenty-one".