1121240021 has 8 divisors (see below), whose sum is σ = 1265349600. Its totient is φ = 984160240.

The previous prime is 1121240017. The next prime is 1121240039. The reversal of 1121240021 is 1200421211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1121240021 - 2² = 1121240017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121239978 and 1121240005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121240221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1757111 + ... + 1757748.

It is an arithmetic number, because the mean of its divisors is an integer number (158168700).

Almost surely, 2^1121240021 is an apocalyptic number.

1121240021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121240021 is a deficient number, since it is larger than the sum of its proper divisors (144109579).

1121240021 is a wasteful number, since it uses less digits than its factorization.

1121240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514899.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1121240021 is about 33484.9222934741. The cubic root of 1121240021 is about 1038.8819410205.

Adding to 1121240021 its reverse (1200421211), we get a palindrome (2321661232).

It can be divided in two parts, 1121 and 240021, that added together give a palindrome (241142).

The spelling of 1121240021 in words is "one billion, one hundred twenty-one million, two hundred forty thousand, twenty-one".