1000021321 has 8 divisors (see below), whose sum is σ = 1081571400. Its totient is φ = 919132032.

The previous prime is 1000021291. The next prime is 1000021333. The reversal of 1000021321 is 1231200001.

It can be written as a sum of positive squares in 4 ways, for example, as 11799225 + 988222096 = 3435^2 + 31436^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1000021321 - 2⁷ = 1000021193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000021298 and 1000021307.

It is not an unprimeable number, because it can be changed into a prime (1000028321) 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 7 ways as a sum of consecutive naturals, for example, 162046 + ... + 168103.

It is an arithmetic number, because the mean of its divisors is an integer number (135196425).

Almost surely, 2^1000021321 is an apocalyptic number.

It is an amenable number.

1000021321 is a deficient number, since it is larger than the sum of its proper divisors (81550079).

1000021321 is a wasteful number, since it uses less digits than its factorization.

1000021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330395.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1000021321 is about 31623.1137144969. The cubic root of 1000021321 is about 1000.0071069495.

Adding to 1000021321 its reverse (1231200001), we get a palindrome (2231221322).

The spelling of 1000021321 in words is "one billion, twenty-one thousand, three hundred twenty-one".