1000121321 has 4 divisors (see below), whose sum is σ = 1004271444. Its totient is φ = 995971200.

The previous prime is 1000121299. The next prime is 1000121341. The reversal of 1000121321 is 1231210001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1231210001 = 7 ⋅175887143.

It can be written as a sum of positive squares in 2 ways, for example, as 326199721 + 673921600 = 18061^2 + 25960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000121321 - 2⁶ = 1000121257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000121341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2074700 + ... + 2075181.

It is an arithmetic number, because the mean of its divisors is an integer number (251067861).

Almost surely, 2^1000121321 is an apocalyptic number.

It is an amenable number.

1000121321 is a deficient number, since it is larger than the sum of its proper divisors (4150123).

1000121321 is an equidigital number, since it uses as much as digits as its factorization.

1000121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150122.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1000121321 is about 31624.6947969463. The cubic root of 1000121321 is about 1000.0404386980.

Adding to 1000121321 its reverse (1231210001), we get a palindrome (2231331322).

The spelling of 1000121321 in words is "one billion, one hundred twenty-one thousand, three hundred twenty-one".