20111220210220 has 12 divisors (see below), whose sum is σ = 42233562441504. Its totient is φ = 8044488084080.

The previous prime is 20111220210217. The next prime is 20111220210227. The reversal of 20111220210220 is 2201202211102.

It is a happy number.

It is a super-2 number, since 2×20111220210220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111220210194 and 20111220210203.

It is not an unprimeable number, because it can be changed into a prime (20111220210227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502780505236 + ... + 502780505275.

It is an arithmetic number, because the mean of its divisors is an integer number (3519463536792).

Almost surely, 2^{20111220210220} is an apocalyptic number.

20111220210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111220210220 is an abundant number, since it is smaller than the sum of its proper divisors (22122342231284).

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

20111220210220 is a wasteful number, since it uses less digits than its factorization.

20111220210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005561010520 (or 1005561010518 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20111220210220 its reverse (2201202211102), we get a palindrome (22312422421322).

The spelling of 20111220210220 in words is "twenty trillion, one hundred eleven billion, two hundred twenty million, two hundred ten thousand, two hundred twenty".