1121521044 has 24 divisors (see below), whose sum is σ = 2990723008. Its totient is φ = 320434560.

The previous prime is 1121521043. The next prime is 1121521057. The reversal of 1121521044 is 4401251211.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1121521044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121521043) 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 7 ways as a sum of consecutive naturals, for example, 6675637 + ... + 6675804.

Almost surely, 2^1121521044 is an apocalyptic number.

1121521044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1121521044 is an abundant number, since it is smaller than the sum of its proper divisors (1869201964).

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

1121521044 is a wasteful number, since it uses less digits than its factorization.

1121521044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13351455 (or 13351453 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1121521044 is about 33489.1182923648. The cubic root of 1121521044 is about 1038.9687274732.

Adding to 1121521044 its reverse (4401251211), we get a palindrome (5522772255).

The spelling of 1121521044 in words is "one billion, one hundred twenty-one million, five hundred twenty-one thousand, forty-four".