221122232021 has 4 divisors (see below), whose sum is σ = 221329082700. Its totient is φ = 220915381344.

The previous prime is 221122231997. The next prime is 221122232059. The reversal of 221122232021 is 120232221122.

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 108619680625 + 112502551396 = 329575^2 + 335414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221122232021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221122231984 and 221122232002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122235021) 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, 103423736 + ... + 103425873.

It is an arithmetic number, because the mean of its divisors is an integer number (55332270675).

Almost surely, 2^221122232021 is an apocalyptic number.

It is an amenable number.

221122232021 is a deficient number, since it is larger than the sum of its proper divisors (206850679).

221122232021 is a wasteful number, since it uses less digits than its factorization.

221122232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206850678.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221122232021 its reverse (120232221122), we get a palindrome (341354453143).

The spelling of 221122232021 in words is "two hundred twenty-one billion, one hundred twenty-two million, two hundred thirty-two thousand, twenty-one".