121221201009 has 16 divisors (see below), whose sum is σ = 170282926080. Its totient is φ = 76494200400.

The previous prime is 121221201001. The next prime is 121221201029. The reversal of 121221201009 is 900102122121.

It is not a de Polignac number, because 121221201009 - 2³ = 121221201001 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121221201001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 858237 + ... + 989450.

It is an arithmetic number, because the mean of its divisors is an integer number (10642682880).

Almost surely, 2^121221201009 is an apocalyptic number.

121221201009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

121221201009 is a deficient number, since it is larger than the sum of its proper divisors (49061725071).

121221201009 is a wasteful number, since it uses less digits than its factorization.

121221201009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848860.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 121221201009 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, nine".