2121221222220 has 48 divisors (see below), whose sum is σ = 5939497444608. Its totient is φ = 565651561920.

The previous prime is 2121221222129. The next prime is 2121221222233. The reversal of 2121221222220 is 222221221212.

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 15 ways as a sum of consecutive naturals, for example, 5572585 + ... + 5941055.

It is an arithmetic number, because the mean of its divisors is an integer number (123739530096).

Almost surely, 2^{2121221222220} is an apocalyptic number.

2121221222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121221222220 is an abundant number, since it is smaller than the sum of its proper divisors (3818276222388).

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

2121221222220 is a wasteful number, since it uses less digits than its factorization.

2121221222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464430 (or 464428 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 2121221222220 its reverse (222221221212), we get a palindrome (2343442443432).

The spelling of 2121221222220 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty".