22312012221 has 10 divisors (see below), whose sum is σ = 33330289982. Its totient is φ = 14874674760.

The previous prime is 22312012187. The next prime is 22312012223. The reversal of 22312012221 is 12221021322.

It can be written as a sum of positive squares in only one way, i.e., 14566076100 + 7745936121 = 120690^2 + 88011^2 .

It is not a de Polignac number, because 22312012221 - 2¹¹ = 22312010173 is a prime.

It is a super-3 number, since 3×22312012221³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22312012194 and 22312012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22312012223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 137728390 + ... + 137728551.

Almost surely, 2^22312012221 is an apocalyptic number.

It is an amenable number.

22312012221 is a deficient number, since it is larger than the sum of its proper divisors (11018277761).

22312012221 is an equidigital number, since it uses as much as digits as its factorization.

22312012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275456953 (or 275456944 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 22312012221 its reverse (12221021322), we get a palindrome (34533033543).

The spelling of 22312012221 in words is "twenty-two billion, three hundred twelve million, twelve thousand, two hundred twenty-one".