220111122121220 has 72 divisors (see below), whose sum is σ = 508078422402432. Its totient is φ = 80039818647360.

The previous prime is 220111122121213. The next prime is 220111122121243. The reversal of 220111122121220 is 22121221111022.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 220111122121192 and 220111122121201.

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 23 ways as a sum of consecutive naturals, for example, 457882709 + ... + 458363171.

Almost surely, 2^{220111122121220} is an apocalyptic number.

220111122121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220111122121220 is an abundant number, since it is smaller than the sum of its proper divisors (287967300281212).

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

220111122121220 is a wasteful number, since it uses less digits than its factorization.

220111122121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669801 (or 669788 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 220111122121220 its reverse (22121221111022), we get a palindrome (242232343232242).

The spelling of 220111122121220 in words is "two hundred twenty trillion, one hundred eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".