100121220121220 has 48 divisors (see below), whose sum is σ = 210484062407808. Its totient is φ = 40004776753920.

The previous prime is 100121220121199. The next prime is 100121220121229. The reversal of 100121220121220 is 22121022121001.

It is not an unprimeable number, because it can be changed into a prime (100121220121229) 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, 652804064 + ... + 652957416.

It is an arithmetic number, because the mean of its divisors is an integer number (4385084633496).

Almost surely, 2^{100121220121220} is an apocalyptic number.

100121220121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121220121220 is an abundant number, since it is smaller than the sum of its proper divisors (110362842286588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100121220121220 is a wasteful number, since it uses less digits than its factorization.

100121220121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188780 (or 188778 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 100121220121220 its reverse (22121022121001), we get a palindrome (122242242242221).

The spelling of 100121220121220 in words is "one hundred trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty".