20101210100220 has 24 divisors (see below), whose sum is σ = 56283388280784. Its totient is φ = 5360322693376.

The previous prime is 20101210100189. The next prime is 20101210100227. The reversal of 20101210100220 is 2200101210102.

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 = 20101210100196 and 20101210100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101210100227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167510084109 + ... + 167510084228.

It is an arithmetic number, because the mean of its divisors is an integer number (2345141178366).

Almost surely, 2^{20101210100220} is an apocalyptic number.

20101210100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101210100220 is an abundant number, since it is smaller than the sum of its proper divisors (36182178180564).

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

20101210100220 is a wasteful number, since it uses less digits than its factorization.

20101210100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335020168349 (or 335020168347 counting only the distinct ones).

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

Adding to 20101210100220 its reverse (2200101210102), we get a palindrome (22301311310322).

The spelling of 20101210100220 in words is "twenty trillion, one hundred one billion, two hundred ten million, one hundred thousand, two hundred twenty".