121131444 has 48 divisors (see below), whose sum is σ = 327853568. Its totient is φ = 34090848.

The previous prime is 121131433. The next prime is 121131481. The reversal of 121131444 is 444131121.

121131444 = 182² + 183² + ... + 717².

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 121131444.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5134 + ... + 16389.

Almost surely, 2^121131444 is an apocalyptic number.

121131444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121131444 is an abundant number, since it is smaller than the sum of its proper divisors (206722124).

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

121131444 is a wasteful number, since it uses less digits than its factorization.

121131444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21604 (or 21602 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 121131444 is about 11005.9731055459. The cubic root of 121131444 is about 494.7877796537.

Adding to 121131444 its reverse (444131121), we get a palindrome (565262565).

The spelling of 121131444 in words is "one hundred twenty-one million, one hundred thirty-one thousand, four hundred forty-four".