2121221112220 has 72 divisors (see below), whose sum is σ = 5302348161264. Its totient is φ = 710362404864.

The previous prime is 2121221112191. The next prime is 2121221112299. The reversal of 2121221112220 is 222111221212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25126597 + ... + 25210876.

It is an arithmetic number, because the mean of its divisors is an integer number (73643724462).

Almost surely, 2^{2121221112220} is an apocalyptic number.

2121221112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121221112220 is an abundant number, since it is smaller than the sum of its proper divisors (3181127049044).

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

2121221112220 is a wasteful number, since it uses less digits than its factorization.

2121221112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50337539 (or 50337530 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2121221112220 its reverse (222111221212), we get a palindrome (2343332333432).

It can be divided in two parts, 2121221 and 112220, that added together give a triangular number (2233441 = T₂₁₁₃).

The spelling of 2121221112220 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty".