100121009 has 8 divisors (see below), whose sum is σ = 100984128. Its totient is φ = 99261360.

The previous prime is 100120987. The next prime is 100121011. The reversal of 100121009 is 900121001.

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 100121009 - 2⁸ = 100120753 is a prime.

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 = 100120984 and 100121002.

It is not an unprimeable number, because it can be changed into a prime (100121029) 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, 109934 + ... + 110840.

It is an arithmetic number, because the mean of its divisors is an integer number (12623016).

Almost surely, 2^100121009 is an apocalyptic number.

It is an amenable number.

100121009 is a deficient number, since it is larger than the sum of its proper divisors (863119).

100121009 is an equidigital number, since it uses as much as digits as its factorization.

100121009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 100121009 is about 10006.0486207094. The cubic root of 100121009 is about 464.3460325668.

The spelling of 100121009 in words is "one hundred million, one hundred twenty-one thousand, nine".