101212100220 has 192 divisors, whose sum is σ = 353515954176. Its totient is φ = 21019557120.

The previous prime is 101212100191. The next prime is 101212100237. The reversal of 101212100220 is 22001212101.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 101212100196 and 101212100205.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 10357777 + ... + 10367543.

It is an arithmetic number, because the mean of its divisors is an integer number (1841228928).

Almost surely, 2^101212100220 is an apocalyptic number.

101212100220 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 101212100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176757977088).

101212100220 is an abundant number, since it is smaller than the sum of its proper divisors (252303853956).

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

101212100220 is a wasteful number, since it uses less digits than its factorization.

101212100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12040 (or 12038 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 101212100220 its reverse (22001212101), we get a palindrome (123213312321).

The spelling of 101212100220 in words is "one hundred one billion, two hundred twelve million, one hundred thousand, two hundred twenty".