521312322444 has 48 divisors (see below), whose sum is σ = 1307171230848. Its totient is φ = 161107930368.

The previous prime is 521312322361. The next prime is 521312322463. The reversal of 521312322444 is 444223213125.

It is a happy number.

It is a super-2 number, since 2×521312322444² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19056874 + ... + 19084209.

It is an arithmetic number, because the mean of its divisors is an integer number (27232733976).

Almost surely, 2^521312322444 is an apocalyptic number.

It is an amenable number.

521312322444 is an abundant number, since it is smaller than the sum of its proper divisors (785858908404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521312322444 is a wasteful number, since it uses less digits than its factorization.

521312322444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38141174 (or 38141172 counting only the distinct ones).

The product of its digits is 46080, while the sum is 33.

Adding to 521312322444 its reverse (444223213125), we get a palindrome (965535535569).

The spelling of 521312322444 in words is "five hundred twenty-one billion, three hundred twelve million, three hundred twenty-two thousand, four hundred forty-four".