2221121221220 has 48 divisors (see below), whose sum is σ = 5138766916416. Its totient is φ = 799683600000.

The previous prime is 2221121221199. The next prime is 2221121221237. The reversal of 2221121221220 is 221221211222.

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 = 2221121221192 and 2221121221201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49958006 + ... + 50002445.

It is an arithmetic number, because the mean of its divisors is an integer number (107057644092).

Almost surely, 2^{2221121221220} is an apocalyptic number.

2221121221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221121221220 is an abundant number, since it is smaller than the sum of its proper divisors (2917645695196).

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

2221121221220 is a wasteful number, since it uses less digits than its factorization.

2221121221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99960572 (or 99960570 counting only the distinct ones).

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

Adding to 2221121221220 its reverse (221221211222), we get a palindrome (2442342432442).

The spelling of 2221121221220 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty".