201121021009 has 8 divisors (see below), whose sum is σ = 208066504320. Its totient is φ = 194176222800.

The previous prime is 201121020911. The next prime is 201121021061. The reversal of 201121021009 is 900120121102.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201121021009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201121021609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466264 + ... + 787174.

It is an arithmetic number, because the mean of its divisors is an integer number (26008313040).

Almost surely, 2^201121021009 is an apocalyptic number.

201121021009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

201121021009 is a deficient number, since it is larger than the sum of its proper divisors (6945483311).

201121021009 is a wasteful number, since it uses less digits than its factorization.

201121021009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342551.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 201121021009 in words is "two hundred one billion, one hundred twenty-one million, twenty-one thousand, nine".