101220100120 has 128 divisors (see below), whose sum is σ = 245066342400. Its totient is φ = 37540339200.

The previous prime is 101220100117. The next prime is 101220100127. The reversal of 101220100120 is 21001022101.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 101220100097 and 101220100106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220100127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4700017 + ... + 4721503.

It is an arithmetic number, because the mean of its divisors is an integer number (1914580800).

Almost surely, 2^101220100120 is an apocalyptic number.

101220100120 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 101220100120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122533171200).

101220100120 is an abundant number, since it is smaller than the sum of its proper divisors (143846242280).

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

101220100120 is a wasteful number, since it uses less digits than its factorization.

101220100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21689 (or 21685 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 101220100120 its reverse (21001022101), we get a palindrome (122221122221).

The spelling of 101220100120 in words is "one hundred one billion, two hundred twenty million, one hundred thousand, one hundred twenty".