2121002332220 has 48 divisors (see below), whose sum is σ = 4462176089280. Its totient is φ = 846864958464.

The previous prime is 2121002332153. The next prime is 2121002332279. The reversal of 2121002332220 is 222332001212.

It is a happy number.

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 = 2121002332192 and 2121002332201.

It is a congruent number.

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, 24920177 + ... + 25005143.

It is an arithmetic number, because the mean of its divisors is an integer number (92962001860).

Almost surely, 2^{2121002332220} is an apocalyptic number.

2121002332220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121002332220 is an abundant number, since it is smaller than the sum of its proper divisors (2341173757060).

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

2121002332220 is a wasteful number, since it uses less digits than its factorization.

2121002332220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87222 (or 87220 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 2121002332220 its reverse (222332001212), we get a palindrome (2343334333432).

The spelling of 2121002332220 in words is "two trillion, one hundred twenty-one billion, two million, three hundred thirty-two thousand, two hundred twenty".