100431221 has 4 divisors (see below), whose sum is σ = 109561344. Its totient is φ = 91301100.

The previous prime is 100431211. The next prime is 100431229. The reversal of 100431221 is 122134001.

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.

It is not a de Polignac number, because 100431221 - 2¹⁴ = 100414837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100431196 and 100431205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100431229) 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, 4565045 + ... + 4565066.

It is an arithmetic number, because the mean of its divisors is an integer number (27390336).

Almost surely, 2^100431221 is an apocalyptic number.

100431221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100431221 is a deficient number, since it is larger than the sum of its proper divisors (9130123).

100431221 is an equidigital number, since it uses as much as digits as its factorization.

100431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9130122.

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

The square root of 100431221 is about 10021.5378560379. The cubic root of 100431221 is about 464.8251101665.

Adding to 100431221 its reverse (122134001), we get a palindrome (222565222).

The spelling of 100431221 in words is "one hundred million, four hundred thirty-one thousand, two hundred twenty-one".