121571320444 has 36 divisors (see below), whose sum is σ = 247562406840. Its totient is φ = 52085587680.

The previous prime is 121571320441. The next prime is 121571320513. The reversal of 121571320444 is 444023175121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121571320441) 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 11 ways as a sum of consecutive naturals, for example, 536839 + ... + 728929.

Almost surely, 2^121571320444 is an apocalyptic number.

121571320444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121571320444 is an abundant number, since it is smaller than the sum of its proper divisors (125991086396).

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

121571320444 is a wasteful number, since it uses less digits than its factorization.

121571320444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195338 (or 195329 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

Adding to 121571320444 its reverse (444023175121), we get a palindrome (565594495565).

The spelling of 121571320444 in words is "one hundred twenty-one billion, five hundred seventy-one million, three hundred twenty thousand, four hundred forty-four".