100120111020 has 96 divisors (see below), whose sum is σ = 311729725440. Its totient is φ = 26677702080.

The previous prime is 100120111019. The next prime is 100120111103. The reversal of 100120111020 is 20111021001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 100120110993 and 100120111011.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 620565 + ... + 765075.

It is an arithmetic number, because the mean of its divisors is an integer number (3247184640).

Almost surely, 2^100120111020 is an apocalyptic number.

100120111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100120111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155864862720).

100120111020 is an abundant number, since it is smaller than the sum of its proper divisors (211609614420).

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

100120111020 is a wasteful number, since it uses less digits than its factorization.

100120111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145812 (or 145804 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 100120111020 its reverse (20111021001), we get a palindrome (120231132021).

The spelling of 100120111020 in words is "one hundred billion, one hundred twenty million, one hundred eleven thousand, twenty".