100121000000209 has 4 divisors (see below), whose sum is σ = 100629228426804. Its totient is φ = 99612771573616.

The previous prime is 100121000000137. The next prime is 100121000000227. The reversal of 100121000000209 is 902000000121001.

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 48273036494400 + 51847963505809 = 6947880^2 + 7200553^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121000000209 - 2²⁷ = 100120865782481 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121000000192 and 100121000000201.

It is not an unprimeable number, because it can be changed into a prime (100121000000269) 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, 254114213002 + ... + 254114213395.

It is an arithmetic number, because the mean of its divisors is an integer number (25157307106701).

Almost surely, 2^{100121000000209} is an apocalyptic number.

It is an amenable number.

100121000000209 is a deficient number, since it is larger than the sum of its proper divisors (508228426595).

100121000000209 is an equidigital number, since it uses as much as digits as its factorization.

100121000000209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508228426594.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 100121000000209 in words is "one hundred trillion, one hundred twenty-one billion, two hundred nine", and thus it is an aban number.