111212122321 has 2 divisors, whose sum is σ = 111212122322. Its totient is φ = 111212122320.

The previous prime is 111212122247. The next prime is 111212122421. The reversal of 111212122321 is 123221212111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102296985921 + 8915136400 = 319839^2 + 94420^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212122321 - 2¹³ = 111212114129 is a prime.

It is a super-2 number, since 2×111212122321² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111212122421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606061160 + 55606061161.

It is an arithmetic number, because the mean of its divisors is an integer number (55606061161).

Almost surely, 2^111212122321 is an apocalyptic number.

It is an amenable number.

111212122321 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212122321 is an equidigital number, since it uses as much as digits as its factorization.

111212122321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 19.

Adding to 111212122321 its reverse (123221212111), we get a palindrome (234433334432).

The spelling of 111212122321 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, three hundred twenty-one".