4023111221221 has 4 divisors (see below), whose sum is σ = 4023686204812. Its totient is φ = 4022536237632.

The previous prime is 4023111221219. The next prime is 4023111221243. The reversal of 4023111221221 is 1221221113204.

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 3042882516996 + 980228704225 = 1744386^2 + 990065^2 .

It is a cyclic number.

It is not a de Polignac number, because 4023111221221 - 2¹ = 4023111221219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4023111221192 and 4023111221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4023111221201) 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, 287481300 + ... + 287495293.

It is an arithmetic number, because the mean of its divisors is an integer number (1005921551203).

Almost surely, 2^{4023111221221} is an apocalyptic number.

It is an amenable number.

4023111221221 is a deficient number, since it is larger than the sum of its proper divisors (574983591).

4023111221221 is an equidigital number, since it uses as much as digits as its factorization.

4023111221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574983590.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 4023111221221 its reverse (1221221113204), we get a palindrome (5244332334425).

The spelling of 4023111221221 in words is "four trillion, twenty-three billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".