1121001021 has 12 divisors (see below), whose sum is σ = 1850541472. Its totient is φ = 640571976.

The previous prime is 1121001001. The next prime is 1121001023. The reversal of 1121001021 is 1201001211.

It is a happy number.

It is not a de Polignac number, because 1121001021 - 2⁵ = 1121000989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1121000994 and 1121001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121001023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8896771 + ... + 8896896.

Almost surely, 2^1121001021 is an apocalyptic number.

It is an amenable number.

1121001021 is a deficient number, since it is larger than the sum of its proper divisors (729540451).

1121001021 is a wasteful number, since it uses less digits than its factorization.

1121001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17793680 (or 17793677 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1121001021 is about 33481.3533328628. The cubic root of 1121001021 is about 1038.8081208383.

Adding to 1121001021 its reverse (1201001211), we get a palindrome (2322002232).

The spelling of 1121001021 in words is "one billion, one hundred twenty-one million, one thousand, twenty-one".