20101100021220 has 48 divisors (see below), whose sum is σ = 56284760746368. Its totient is φ = 5360133273600.

The previous prime is 20101100021161. The next prime is 20101100021221. The reversal of 20101100021220 is 2212000110102.

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 = 20101100021196 and 20101100021205.

It is not an unprimeable number, because it can be changed into a prime (20101100021221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2969184 + ... + 7001303.

It is an arithmetic number, because the mean of its divisors is an integer number (1172599182216).

Almost surely, 2^{20101100021220} is an apocalyptic number.

20101100021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101100021220 is an abundant number, since it is smaller than the sum of its proper divisors (36183660725148).

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

20101100021220 is a wasteful number, since it uses less digits than its factorization.

20101100021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10004100 (or 10004098 counting only the distinct ones).

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

Adding to 20101100021220 its reverse (2212000110102), we get a palindrome (22313100131322).

The spelling of 20101100021220 in words is "twenty trillion, one hundred one billion, one hundred million, twenty-one thousand, two hundred twenty".