1021312009 has 16 divisors (see below), whose sum is σ = 1112057856. Its totient is φ = 934156800.

The previous prime is 1021311983. The next prime is 1021312027. The reversal of 1021312009 is 9002131201.

It is not a de Polignac number, because 1021312009 - 2²⁷ = 887094281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021312609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186184 + ... + 191590.

It is an arithmetic number, because the mean of its divisors is an integer number (69503616).

Almost surely, 2^1021312009 is an apocalyptic number.

It is an amenable number.

1021312009 is a deficient number, since it is larger than the sum of its proper divisors (90745847).

1021312009 is a wasteful number, since it uses less digits than its factorization.

1021312009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5736.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1021312009 is about 31957.9725420747. The cubic root of 1021312009 is about 1007.0541253101.

It can be divided in two parts, 10213 and 12009, that added together give a palindrome (22222).

The spelling of 1021312009 in words is "one billion, twenty-one million, three hundred twelve thousand, nine".