20121000009 has 8 divisors (see below), whose sum is σ = 29266909152. Its totient is φ = 12194545440.

The previous prime is 20120999993. The next prime is 20121000013. The reversal of 20121000009 is 90000012102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20121000009 - 2⁴ = 20120999993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121000049) 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, 304863604 + ... + 304863669.

It is an arithmetic number, because the mean of its divisors is an integer number (3658363644).

Almost surely, 2^20121000009 is an apocalyptic number.

It is an amenable number.

20121000009 is a deficient number, since it is larger than the sum of its proper divisors (9145909143).

20121000009 is a wasteful number, since it uses less digits than its factorization.

20121000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609727287.

The product of its (nonzero) digits is 36, while the sum is 15.

The spelling of 20121000009 in words is "twenty billion, one hundred twenty-one million, nine", and thus it is an aban number.