100021321 has 8 divisors (see below), whose sum is σ = 101692800. Its totient is φ = 98357280.

The previous prime is 100021309. The next prime is 100021331. The reversal of 100021321 is 123120001.

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

It is a cyclic number.

It is not a de Polignac number, because 100021321 - 2⁵ = 100021289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100021298 and 100021307.

It is not an unprimeable number, because it can be changed into a prime (100021331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29565 + ... + 32773.

It is an arithmetic number, because the mean of its divisors is an integer number (12711600).

Almost surely, 2^100021321 is an apocalyptic number.

It is an amenable number.

100021321 is a deficient number, since it is larger than the sum of its proper divisors (1671479).

100021321 is an equidigital number, since it uses as much as digits as its factorization.

100021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719.

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

The square root of 100021321 is about 10001.0659931829. The cubic root of 100021321 is about 464.1918687890.

Adding to 100021321 its reverse (123120001), we get a palindrome (223141322).

The spelling of 100021321 in words is "one hundred million, twenty-one thousand, three hundred twenty-one".