1121021001 has 6 divisors (see below), whose sum is σ = 1619252570. Its totient is φ = 747347328.

The previous prime is 1121020993. The next prime is 1121021093. The reversal of 1121021001 is 1001201211.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 748569600 + 372451401 = 27360^2 + 19299^2 .

It is not a de Polignac number, because 1121021001 - 2³ = 1121020993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 124557889 = 1121021001 / (1 + 1 + 2 + 1 + 0 + 2 + 1 + 0 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1121021501) 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 5 ways as a sum of consecutive naturals, for example, 62278936 + ... + 62278953.

Almost surely, 2^1121021001 is an apocalyptic number.

It is an amenable number.

1121021001 is a deficient number, since it is larger than the sum of its proper divisors (498231569).

1121021001 is a wasteful number, since it uses less digits than its factorization.

1121021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124557895 (or 124557892 counting only the distinct ones).

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

The square root of 1121021001 is about 33481.6517065691. The cubic root of 1121021001 is about 1038.8142924839.

Adding to 1121021001 its reverse (1001201211), we get a palindrome (2122222212).

The spelling of 1121021001 in words is "one billion, one hundred twenty-one million, twenty-one thousand, one".