100121221120 has 48 divisors (see below), whose sum is σ = 240232290480. Its totient is φ = 40048484352.

The previous prime is 100121221099. The next prime is 100121221147. The reversal of 100121221120 is 21122121001.

It is a self number, because there is not a number n which added to its sum of digits gives 100121221120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4878492 + ... + 4898971.

It is an arithmetic number, because the mean of its divisors is an integer number (5004839385).

Almost surely, 2^100121221120 is an apocalyptic number.

100121221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121221120 is an abundant number, since it is smaller than the sum of its proper divisors (140111069360).

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

100121221120 is an frugal number, since it uses more digits than its factorization.

100121221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9777490 (or 9777470 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 100121221120 its reverse (21122121001), we get a palindrome (121243342121).

The spelling of 100121221120 in words is "one hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty".