2121122202021 has 48 divisors (see below), whose sum is σ = 3113777272320. Its totient is φ = 1391221449600.

The previous prime is 2121122201969. The next prime is 2121122202037. The reversal of 2121122202021 is 1202022211212.

It is a happy number.

It is not a de Polignac number, because 2121122202021 - 2⁹ = 2121122201509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121122201985 and 2121122202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121122202041) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 498030790 + ... + 498035048.

It is an arithmetic number, because the mean of its divisors is an integer number (64870359840).

Almost surely, 2^{2121122202021} is an apocalyptic number.

It is an amenable number.

2121122202021 is a deficient number, since it is larger than the sum of its proper divisors (992655070299).

2121122202021 is a wasteful number, since it uses less digits than its factorization.

2121122202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7706 (or 7703 counting only the distinct ones).

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

Adding to 2121122202021 its reverse (1202022211212), we get a palindrome (3323144413233).

The spelling of 2121122202021 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred two thousand, twenty-one".