2121123222021 has 16 divisors (see below), whose sum is σ = 2830868883648. Its totient is φ = 1412730508800.

The previous prime is 2121123222017. The next prime is 2121123222037. The reversal of 2121123222021 is 1202223211212.

It is not a de Polignac number, because 2121123222021 - 2² = 2121123222017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121123122021) 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 15 ways as a sum of consecutive naturals, for example, 13224115 + ... + 13383551.

It is an arithmetic number, because the mean of its divisors is an integer number (176929305228).

Almost surely, 2^{2121123222021} is an apocalyptic number.

It is an amenable number.

2121123222021 is a deficient number, since it is larger than the sum of its proper divisors (709745661627).

2121123222021 is a wasteful number, since it uses less digits than its factorization.

2121123222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163652.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 2121123222021 its reverse (1202223211212), we get a palindrome (3323346433233).

The spelling of 2121123222021 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred twenty-two thousand, twenty-one".