100121120021220 has 24 divisors (see below), whose sum is σ = 280339136059584. Its totient is φ = 26698965338976.

The previous prime is 100121120021171. The next prime is 100121120021257. The reversal of 100121120021220 is 22120021121001.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 100121120021220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834342666784 + ... + 834342666903.

It is an arithmetic number, because the mean of its divisors is an integer number (11680797335816).

Almost surely, 2^{100121120021220} is an apocalyptic number.

100121120021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121120021220 is an abundant number, since it is smaller than the sum of its proper divisors (180218016038364).

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

100121120021220 is a wasteful number, since it uses less digits than its factorization.

100121120021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668685333699 (or 1668685333697 counting only the distinct ones).

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

Adding to 100121120021220 its reverse (22120021121001), we get a palindrome (122241141142221).

The spelling of 100121120021220 in words is "one hundred trillion, one hundred twenty-one billion, one hundred twenty million, twenty-one thousand, two hundred twenty".