2121233220021 has 8 divisors (see below), whose sum is σ = 2829775654944. Its totient is φ = 1413423132560.

The previous prime is 2121233220013. The next prime is 2121233220037. The reversal of 2121233220021 is 1200223321212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121233220021 - 2³ = 2121233220013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121233220021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121233220721) 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 7 ways as a sum of consecutive naturals, for example, 183080106 + ... + 183091691.

It is an arithmetic number, because the mean of its divisors is an integer number (353721956868).

Almost surely, 2^{2121233220021} is an apocalyptic number.

It is an amenable number.

2121233220021 is a deficient number, since it is larger than the sum of its proper divisors (708542434923).

2121233220021 is a wasteful number, since it uses less digits than its factorization.

2121233220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366173731.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 2121233220021 its reverse (1200223321212), we get a palindrome (3321456541233).

The spelling of 2121233220021 in words is "two trillion, one hundred twenty-one billion, two hundred thirty-three million, two hundred twenty thousand, twenty-one".