100000121221221 has 32 divisors (see below), whose sum is σ = 150055371755520. Its totient is φ = 58828526334144.

The previous prime is 100000121221213. The next prime is 100000121221241. The reversal of 100000121221221 is 122122121000001.

It is not a de Polignac number, because 100000121221221 - 2³ = 100000121221213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100000121221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000121221241) 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, 634286761 + ... + 634444398.

It is an arithmetic number, because the mean of its divisors is an integer number (4689230367360).

Almost surely, 2^{100000121221221} is an apocalyptic number.

It is an amenable number.

100000121221221 is a deficient number, since it is larger than the sum of its proper divisors (50055250534299).

100000121221221 is a wasteful number, since it uses less digits than its factorization.

100000121221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268731265.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 100000121221221 its reverse (122122121000001), we get a palindrome (222122242221222).

The spelling of 100000121221221 in words is "one hundred trillion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".