2221232320121 has 4 divisors (see below), whose sum is σ = 2351893044852. Its totient is φ = 2090571595392.

The previous prime is 2221232320061. The next prime is 2221232320129. The reversal of 2221232320121 is 1210232321222.

It is a happy number.

2221232320121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1582249515625 + 638982804496 = 1257875^2 + 799364^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221232320121 - 2²² = 2221228125817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221232320129) 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, 65330362340 + ... + 65330362373.

It is an arithmetic number, because the mean of its divisors is an integer number (587973261213).

Almost surely, 2^{2221232320121} is an apocalyptic number.

It is an amenable number.

2221232320121 is a deficient number, since it is larger than the sum of its proper divisors (130660724731).

2221232320121 is a wasteful number, since it uses less digits than its factorization.

2221232320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130660724730.

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

Adding to 2221232320121 its reverse (1210232321222), we get a palindrome (3431464641343).

The spelling of 2221232320121 in words is "two trillion, two hundred twenty-one billion, two hundred thirty-two million, three hundred twenty thousand, one hundred twenty-one".