100221001 has 4 divisors (see below), whose sum is σ = 106116372. Its totient is φ = 94325632.

The previous prime is 100220993. The next prime is 100221019. The reversal of 100221001 is 100122001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94070601 + 6150400 = 9699^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221001 - 2³ = 100220993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100221101) 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, 2947660 + ... + 2947693.

It is an arithmetic number, because the mean of its divisors is an integer number (26529093).

Almost surely, 2^100221001 is an apocalyptic number.

It is an amenable number.

100221001 is a deficient number, since it is larger than the sum of its proper divisors (5895371).

100221001 is an equidigital number, since it uses as much as digits as its factorization.

100221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895370.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 100221001 is about 10011.0439515567. The cubic root of 100221001 is about 464.5005637037.

Adding to 100221001 its reverse (100122001), we get a palindrome (200343002).

The spelling of 100221001 in words is "one hundred million, two hundred twenty-one thousand, one".