100921009 has 8 divisors (see below), whose sum is σ = 116417088. Its totient is φ = 85694640.

The previous prime is 100920991. The next prime is 100921019. The reversal of 100921009 is 900129001.

100921009 = 393² + 394² + ... + 713².

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 100921009 - 2⁵ = 100920977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100921019) 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, 66622 + ... + 68119.

It is an arithmetic number, because the mean of its divisors is an integer number (14552136).

Almost surely, 2^100921009 is an apocalyptic number.

It is an amenable number.

100921009 is a deficient number, since it is larger than the sum of its proper divisors (15496079).

100921009 is a wasteful number, since it uses less digits than its factorization.

100921009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134855.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 100921009 is about 10045.9449032931. The cubic root of 100921009 is about 465.5795125692.

The spelling of 100921009 in words is "one hundred million, nine hundred twenty-one thousand, nine".