222131320021 has 6 divisors (see below), whose sum is σ = 240532731330. Its totient is φ = 205044295248.

The previous prime is 222131320007. The next prime is 222131320027. The reversal of 222131320021 is 120023131222.

It can be written as a sum of positive squares in 3 ways, for example, as 65124900 + 222066195121 = 8070^2 + 471239^2 .

It is not a de Polignac number, because 222131320021 - 2²⁷ = 221997102293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222131320027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 657193086 + ... + 657193423.

It is an arithmetic number, because the mean of its divisors is an integer number (40088788555).

Almost surely, 2^222131320021 is an apocalyptic number.

It is an amenable number.

222131320021 is a deficient number, since it is larger than the sum of its proper divisors (18401411309).

222131320021 is a wasteful number, since it uses less digits than its factorization.

222131320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314386535 (or 1314386522 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 222131320021 its reverse (120023131222), we get a palindrome (342154451243).

The spelling of 222131320021 in words is "two hundred twenty-two billion, one hundred thirty-one million, three hundred twenty thousand, twenty-one".