2121220323221 has 4 divisors (see below), whose sum is σ = 2122468836000. Its totient is φ = 2119971810444.

The previous prime is 2121220323217. The next prime is 2121220323269. The reversal of 2121220323221 is 1223230221212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121220323221 - 2² = 2121220323217 is a prime.

It is a super-3 number, since 3×2121220323221³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121220323821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624253841 + ... + 624257238.

It is an arithmetic number, because the mean of its divisors is an integer number (530617209000).

Almost surely, 2^{2121220323221} is an apocalyptic number.

It is an amenable number.

2121220323221 is a deficient number, since it is larger than the sum of its proper divisors (1248512779).

2121220323221 is a wasteful number, since it uses less digits than its factorization.

2121220323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248512778.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 2121220323221 its reverse (1223230221212), we get a palindrome (3344450544433).

The spelling of 2121220323221 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, three hundred twenty-three thousand, two hundred twenty-one".