2111221222220 has 96 divisors (see below), whose sum is σ = 5168984647680. Its totient is φ = 715803991040.

The previous prime is 2111221222207. The next prime is 2111221222223. The reversal of 2111221222220 is 222221221112.

It is a super-2 number, since 2×2111221222220² (a number of 25 digits) contains 22 as substring.

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 = 2111221222192 and 2111221222201.

It is not an unprimeable number, because it can be changed into a prime (2111221222223) 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 31 ways as a sum of consecutive naturals, for example, 2237660 + ... + 3038019.

It is an arithmetic number, because the mean of its divisors is an integer number (53843590080).

Almost surely, 2^{2111221222220} is an apocalyptic number.

2111221222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111221222220 is an abundant number, since it is smaller than the sum of its proper divisors (3057763425460).

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

2111221222220 is a wasteful number, since it uses less digits than its factorization.

2111221222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5275823 (or 5275821 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2111221222220 its reverse (222221221112), we get a palindrome (2333442443332).

The spelling of 2111221222220 in words is "two trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty".