100667221 has 4 divisors (see below), whose sum is σ = 100691692. Its totient is φ = 100642752.

The previous prime is 100667213. The next prime is 100667227. The reversal of 100667221 is 122766001.

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 58599025 + 42068196 = 7655^2 + 6486^2 .

It is a cyclic number.

It is not a de Polignac number, because 100667221 - 2³ = 100667213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100667227) 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, 4386 + ... + 14851.

It is an arithmetic number, because the mean of its divisors is an integer number (25172923).

Almost surely, 2^100667221 is an apocalyptic number.

It is an amenable number.

100667221 is a deficient number, since it is larger than the sum of its proper divisors (24471).

100667221 is an equidigital number, since it uses as much as digits as its factorization.

100667221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24470.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 100667221 is about 10033.3055868941. The cubic root of 100667221 is about 465.1889177259.

The spelling of 100667221 in words is "one hundred million, six hundred sixty-seven thousand, two hundred twenty-one".