1121021005 has 16 divisors (see below), whose sum is σ = 1487861424. Its totient is φ = 805455360.

The previous prime is 1121020993. The next prime is 1121021093. The reversal of 1121021005 is 5001201211.

It can be written as a sum of positive squares in 8 ways, for example, as 76632516 + 1044388489 = 8754^2 + 32317^2 .

It is not a de Polignac number, because 1121021005 - 2¹¹ = 1121018957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230656 + ... + 235465.

It is an arithmetic number, because the mean of its divisors is an integer number (92991339).

Almost surely, 2^1121021005 is an apocalyptic number.

It is an amenable number.

1121021005 is a deficient number, since it is larger than the sum of its proper divisors (366840419).

1121021005 is a wasteful number, since it uses less digits than its factorization.

1121021005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466176.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1121021005 is about 33481.6517663033. The cubic root of 1121021005 is about 1038.8142937195.

Adding to 1121021005 its reverse (5001201211), we get a palindrome (6122222216).

The spelling of 1121021005 in words is "one billion, one hundred twenty-one million, twenty-one thousand, five".