2121220222220 has 24 divisors (see below), whose sum is σ = 4859522691408. Its totient is φ = 771352808000.

The previous prime is 2121220222181. The next prime is 2121220222243. The reversal of 2121220222220 is 222220221212.

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 = 2121220222192 and 2121220222201.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4820954831 + ... + 4820955270.

It is an arithmetic number, because the mean of its divisors is an integer number (202480112142).

Almost surely, 2^{2121220222220} is an apocalyptic number.

2121220222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121220222220 is an abundant number, since it is smaller than the sum of its proper divisors (2738302469188).

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

2121220222220 is a wasteful number, since it uses less digits than its factorization.

2121220222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9641910121 (or 9641910119 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 2121220222220 its reverse (222220221212), we get a palindrome (2343440443432).

The spelling of 2121220222220 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty".