111021323221 has 2 divisors, whose sum is σ = 111021323222. Its totient is φ = 111021323220.

The previous prime is 111021323197. The next prime is 111021323249. The reversal of 111021323221 is 122323120111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75906311121 + 35115012100 = 275511^2 + 187390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111021323221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111021323251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510661610 + 55510661611.

It is an arithmetic number, because the mean of its divisors is an integer number (55510661611).

Almost surely, 2^111021323221 is an apocalyptic number.

It is an amenable number.

111021323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021323221 is an equidigital number, since it uses as much as digits as its factorization.

111021323221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 111021323221 its reverse (122323120111), we get a palindrome (233344443332).

The spelling of 111021323221 in words is "one hundred eleven billion, twenty-one million, three hundred twenty-three thousand, two hundred twenty-one".