100121222009 has 4 divisors (see below), whose sum is σ = 103350938880. Its totient is φ = 96891505140.

The previous prime is 100121221987. The next prime is 100121222017. The reversal of 100121222009 is 900222121001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100121222009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100121222029) 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, 1614858389 + ... + 1614858450.

It is an arithmetic number, because the mean of its divisors is an integer number (25837734720).

Almost surely, 2^100121222009 is an apocalyptic number.

It is an amenable number.

100121222009 is a deficient number, since it is larger than the sum of its proper divisors (3229716871).

100121222009 is an equidigital number, since it uses as much as digits as its factorization.

100121222009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229716870.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 100121222009 in words is "one hundred billion, one hundred twenty-one million, two hundred twenty-two thousand, nine".