2121212120202 has 48 divisors (see below), whose sum is σ = 5276079244800. Its totient is φ = 603342837216.

The previous prime is 2121212120171. The next prime is 2121212120227. The reversal of 2121212120202 is 2020212121212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37718577 + ... + 37774772.

It is an arithmetic number, because the mean of its divisors is an integer number (109918317600).

Almost surely, 2^{2121212120202} is an apocalyptic number.

2121212120202 is an abundant number, since it is smaller than the sum of its proper divisors (3154867124598).

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

2121212120202 is a wasteful number, since it uses less digits than its factorization.

2121212120202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75493587 (or 75493584 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2121212120202 its reverse (2020212121212), we get a palindrome (4141424241414).

The spelling of 2121212120202 in words is "two trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, two hundred two".