20101211222220 has 144 divisors (see below), whose sum is σ = 64185016896000. Its totient is φ = 5078026498176.

The previous prime is 20101211222159. The next prime is 20101211222227. The reversal of 20101211222220 is 2222211210102.

It is a happy number.

20101211222220 is a `hidden beast` number, since 2 + 0 + 10 + 1 + 211 + 222 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20101211222193 and 20101211222202.

It is not an unprimeable number, because it can be changed into a prime (20101211222227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120776221 + ... + 120942539.

It is an arithmetic number, because the mean of its divisors is an integer number (445729284000).

Almost surely, 2^{20101211222220} is an apocalyptic number.

20101211222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101211222220 is an abundant number, since it is smaller than the sum of its proper divisors (44083805673780).

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

20101211222220 is a wasteful number, since it uses less digits than its factorization.

20101211222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201692 (or 201687 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20101211222220 its reverse (2222211210102), we get a palindrome (22323422432322).

The spelling of 20101211222220 in words is "twenty trillion, one hundred one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred twenty".