100421321 has 24 divisors (see below), whose sum is σ = 135589824. Its totient is φ = 72221760.

The previous prime is 100421317. The next prime is 100421323. The reversal of 100421321 is 123124001.

It is not a de Polignac number, because 100421321 - 2² = 100421317 is a prime.

It is a super-2 number, since 2×100421321² = 20168883422770082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100421296 and 100421305.

It is not an unprimeable number, because it can be changed into a prime (100421323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9155 + ... + 16871.

It is an arithmetic number, because the mean of its divisors is an integer number (5649576).

Almost surely, 2^100421321 is an apocalyptic number.

100421321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100421321 is a deficient number, since it is larger than the sum of its proper divisors (35168503).

100421321 is a wasteful number, since it uses less digits than its factorization.

100421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7761 (or 7748 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 100421321 is about 10021.0439076974. The cubic root of 100421321 is about 464.8098362979.

Adding to 100421321 its reverse (123124001), we get a palindrome (223545322).

The spelling of 100421321 in words is "one hundred million, four hundred twenty-one thousand, three hundred twenty-one".