121200000221 has 16 divisors (see below), whose sum is σ = 128882036736. Its totient is φ = 113719896576.

The previous prime is 121200000211. The next prime is 121200000263. The reversal of 121200000221 is 122000002121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121200000221 - 2¹⁴ = 121199983837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200000211) 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, 10176356 + ... + 10188258.

It is an arithmetic number, because the mean of its divisors is an integer number (8055127296).

Almost surely, 2^121200000221 is an apocalyptic number.

It is an amenable number.

121200000221 is a deficient number, since it is larger than the sum of its proper divisors (7682036515).

121200000221 is a wasteful number, since it uses less digits than its factorization.

121200000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20332.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121200000221 its reverse (122000002121), we get a palindrome (243200002342).

The spelling of 121200000221 in words is "one hundred twenty-one billion, two hundred million, two hundred twenty-one", and thus it is an aban number.