2021210212122 has 32 divisors (see below), whose sum is σ = 4596033562560. Its totient is φ = 658068440400.

The previous prime is 2021210212121. The next prime is 2021210212129. The reversal of 2021210212122 is 2212120121202.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 2021210212095 and 2021210212104.

It is not an unprimeable number, because it can be changed into a prime (2021210212121) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 435228129 + ... + 435232772.

It is an arithmetic number, because the mean of its divisors is an integer number (143626048830).

Almost surely, 2^{2021210212122} is an apocalyptic number.

2021210212122 is an abundant number, since it is smaller than the sum of its proper divisors (2574823350438).

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

2021210212122 is a wasteful number, since it uses less digits than its factorization.

2021210212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870460955 (or 870460949 counting only the distinct ones).

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

Adding to 2021210212122 its reverse (2212120121202), we get a palindrome (4233330333324).

The spelling of 2021210212122 in words is "two trillion, twenty-one billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-two".