1100012021 has 6 divisors (see below), whose sum is σ = 1139252322. Its totient is φ = 1062079760.

The previous prime is 1100011999. The next prime is 1100012027. The reversal of 1100012021 is 1202100011.

It can be written as a sum of positive squares in 3 ways, for example, as 45711121 + 1054300900 = 6761^2 + 32470^2 .

It is not a de Polignac number, because 1100012021 - 2¹⁸ = 1099749877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100012027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 653150 + ... + 654831.

It is an arithmetic number, because the mean of its divisors is an integer number (189875387).

Almost surely, 2^1100012021 is an apocalyptic number.

It is an amenable number.

1100012021 is a deficient number, since it is larger than the sum of its proper divisors (39240301).

1100012021 is an equidigital number, since it uses as much as digits as its factorization.

1100012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308039 (or 1308010 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1100012021 is about 33166.4291264525. The cubic root of 1100012021 is about 1032.2838757576.

Adding to 1100012021 its reverse (1202100011), we get a palindrome (2302112032).

The spelling of 1100012021 in words is "one billion, one hundred million, twelve thousand, twenty-one".