2221221121021 has 8 divisors (see below), whose sum is σ = 2538637027200. Its totient is φ = 1903829865648.

The previous prime is 2221221121013. The next prime is 2221221121051. The reversal of 2221221121021 is 1201211221222.

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 2221221121021 - 2³ = 2221221121013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221221121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221221121001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5969206 + ... + 6330391.

It is an arithmetic number, because the mean of its divisors is an integer number (317329628400).

Almost surely, 2^{2221221121021} is an apocalyptic number.

It is an amenable number.

2221221121021 is a deficient number, since it is larger than the sum of its proper divisors (317415906179).

2221221121021 is a wasteful number, since it uses less digits than its factorization.

2221221121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12325403.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2221221121021 its reverse (1201211221222), we get a palindrome (3422432342243).

The spelling of 2221221121021 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty-one".