1012443121 has 16 divisors (see below), whose sum is σ = 1049241600. Its totient is φ = 976390848.

The previous prime is 1012443119. The next prime is 1012443151. The reversal of 1012443121 is 1213442101.

It is a cyclic number.

It is not a de Polignac number, because 1012443121 - 2¹ = 1012443119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012443151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1172736 + ... + 1173598.

It is an arithmetic number, because the mean of its divisors is an integer number (65577600).

Almost surely, 2^1012443121 is an apocalyptic number.

It is an amenable number.

1012443121 is a deficient number, since it is larger than the sum of its proper divisors (36798479).

1012443121 is a wasteful number, since it uses less digits than its factorization.

1012443121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1012443121 is about 31818.9113735841. The cubic root of 1012443121 is about 1004.1306214740.

Adding to 1012443121 its reverse (1213442101), we get a palindrome (2225885222).

The spelling of 1012443121 in words is "one billion, twelve million, four hundred forty-three thousand, one hundred twenty-one".