221100000121 has 32 divisors (see below), whose sum is σ = 296953106688. Its totient is φ = 158983914240.

The previous prime is 221100000053. The next prime is 221100000127. The reversal of 221100000121 is 121000001122.

It is a cyclic number.

It is not a de Polignac number, because 221100000121 - 2²³ = 221091611513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221100000098 and 221100000107.

It is not an unprimeable number, because it can be changed into a prime (221100000127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3384055 + ... + 3448771.

It is an arithmetic number, because the mean of its divisors is an integer number (9279784584).

Almost surely, 2^221100000121 is an apocalyptic number.

It is an amenable number.

221100000121 is a deficient number, since it is larger than the sum of its proper divisors (75853106567).

221100000121 is a wasteful number, since it uses less digits than its factorization.

221100000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68161.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221100000121 its reverse (121000001122), we get a palindrome (342100001243).

The spelling of 221100000121 in words is "two hundred twenty-one billion, one hundred million, one hundred twenty-one", and thus it is an aban number.