121221000101 has 16 divisors (see below), whose sum is σ = 123809627520. Its totient is φ = 118661114880.

The previous prime is 121221000097. The next prime is 121221000149. The reversal of 121221000101 is 101000122121.

It is a cyclic number.

It is not a de Polignac number, because 121221000101 - 2² = 121221000097 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 (121221000191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19204736 + ... + 19211046.

It is an arithmetic number, because the mean of its divisors is an integer number (7738101720).

Almost surely, 2^121221000101 is an apocalyptic number.

It is an amenable number.

121221000101 is a deficient number, since it is larger than the sum of its proper divisors (2588627419).

121221000101 is a wasteful number, since it uses less digits than its factorization.

121221000101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8524.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121221000101 its reverse (101000122121), we get a palindrome (222221122222).

The spelling of 121221000101 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred one", and thus it is an aban number.