111211225210321 has 2 divisors, whose sum is σ = 111211225210322. Its totient is φ = 111211225210320.

The previous prime is 111211225210313. The next prime is 111211225210361. The reversal of 111211225210321 is 123012522112111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79317477233296 + 31893747977025 = 8906036^2 + 5647455^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211225210321 - 2³ = 111211225210313 is a prime.

It is a super-2 number, since 2×111211225210321² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111211225210361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605612605160 + 55605612605161.

It is an arithmetic number, because the mean of its divisors is an integer number (55605612605161).

Almost surely, 2^{111211225210321} is an apocalyptic number.

It is an amenable number.

111211225210321 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211225210321 is an equidigital number, since it uses as much as digits as its factorization.

111211225210321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 25.

Adding to 111211225210321 its reverse (123012522112111), we get a palindrome (234223747322432).

The spelling of 111211225210321 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twenty-five million, two hundred ten thousand, three hundred twenty-one".