521446421 has 4 divisors (see below), whose sum is σ = 527728992. Its totient is φ = 515163852.

The previous prime is 521446391. The next prime is 521446427. The reversal of 521446421 is 124644125.

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 521446421 - 2⁶ = 521446357 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 (521446427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3141161 + ... + 3141326.

It is an arithmetic number, because the mean of its divisors is an integer number (131932248).

Almost surely, 2^521446421 is an apocalyptic number.

It is an amenable number.

521446421 is a deficient number, since it is larger than the sum of its proper divisors (6282571).

521446421 is an equidigital number, since it uses as much as digits as its factorization.

521446421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6282570.

The product of its digits is 7680, while the sum is 29.

The square root of 521446421 is about 22835.2013566774. The cubic root of 521446421 is about 804.8900591856.

The spelling of 521446421 in words is "five hundred twenty-one million, four hundred forty-six thousand, four hundred twenty-one".