1002136321 has 4 divisors (see below), whose sum is σ = 1006329600. Its totient is φ = 997943044.

The previous prime is 1002136313. The next prime is 1002136327. The reversal of 1002136321 is 1236312001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1236312001 = 79 ⋅15649519.

It is a cyclic number.

It is not a de Polignac number, because 1002136321 - 2³ = 1002136313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002136327) 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, 2096281 + ... + 2096758.

It is an arithmetic number, because the mean of its divisors is an integer number (251582400).

Almost surely, 2^1002136321 is an apocalyptic number.

It is an amenable number.

1002136321 is a deficient number, since it is larger than the sum of its proper divisors (4193279).

1002136321 is an equidigital number, since it uses as much as digits as its factorization.

1002136321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193278.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1002136321 is about 31656.5367815243. The cubic root of 1002136321 is about 1000.7116005046.

Adding to 1002136321 its reverse (1236312001), we get a palindrome (2238448322).

The spelling of 1002136321 in words is "one billion, two million, one hundred thirty-six thousand, three hundred twenty-one".