1121125021 has 16 divisors (see below), whose sum is σ = 1164168000. Its totient is φ = 1079111808.

The previous prime is 1121124989. The next prime is 1121125043. The reversal of 1121125021 is 1205211211.

It is a cyclic number.

It is not a de Polignac number, because 1121125021 - 2⁵ = 1121124989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121124986 and 1121125004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121125721) 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 15 ways as a sum of consecutive naturals, for example, 640870 + ... + 642616.

It is an arithmetic number, because the mean of its divisors is an integer number (72760500).

Almost surely, 2^1121125021 is an apocalyptic number.

It is an amenable number.

1121125021 is a deficient number, since it is larger than the sum of its proper divisors (43042979).

1121125021 is a wasteful number, since it uses less digits than its factorization.

1121125021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 1121125021 is about 33483.2050586559. The cubic root of 1121125021 is about 1038.8464221587.

Adding to 1121125021 its reverse (1205211211), we get a palindrome (2326336232).

The spelling of 1121125021 in words is "one billion, one hundred twenty-one million, one hundred twenty-five thousand, twenty-one".