222131123021 has 4 divisors (see below), whose sum is σ = 222210430044. Its totient is φ = 222051816000.

The previous prime is 222131123017. The next prime is 222131123087. The reversal of 222131123021 is 120321131222.

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 128042308900 + 94088814121 = 357830^2 + 306739^2 .

It is a cyclic number.

It is not a de Polignac number, because 222131123021 - 2² = 222131123017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222131122984 and 222131123002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222136123021) 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, 39649310 + ... + 39654911.

It is an arithmetic number, because the mean of its divisors is an integer number (55552607511).

Almost surely, 2^222131123021 is an apocalyptic number.

It is an amenable number.

222131123021 is a deficient number, since it is larger than the sum of its proper divisors (79307023).

222131123021 is an equidigital number, since it uses as much as digits as its factorization.

222131123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79307022.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 222131123021 its reverse (120321131222), we get a palindrome (342452254243).

The spelling of 222131123021 in words is "two hundred twenty-two billion, one hundred thirty-one million, one hundred twenty-three thousand, twenty-one".