1012132321 has 4 divisors (see below), whose sum is σ = 1012666644. Its totient is φ = 1011598000.

The previous prime is 1012132307. The next prime is 1012132327. The reversal of 1012132321 is 1232312101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 253956096 + 758176225 = 15936^2 + 27535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012132321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012132295 and 1012132304.

It is not an unprimeable number, because it can be changed into a prime (1012132327) 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 3 ways as a sum of consecutive naturals, for example, 264310 + ... + 268111.

It is an arithmetic number, because the mean of its divisors is an integer number (253166661).

Almost surely, 2^1012132321 is an apocalyptic number.

It is an amenable number.

1012132321 is a deficient number, since it is larger than the sum of its proper divisors (534323).

1012132321 is an equidigital number, since it uses as much as digits as its factorization.

1012132321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534322.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1012132321 is about 31814.0271106944. The cubic root of 1012132321 is about 1004.0278615491.

Adding to 1012132321 its reverse (1232312101), we get a palindrome (2244444422).

The spelling of 1012132321 in words is "one billion, twelve million, one hundred thirty-two thousand, three hundred twenty-one".