111021212110981 has 2 divisors, whose sum is σ = 111021212110982. Its totient is φ = 111021212110980.

The previous prime is 111021212110979. The next prime is 111021212110999. The reversal of 111021212110981 is 189011212120111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88630287181956 + 22390924929025 = 9414366^2 + 4731905^2 .

It is a cyclic number.

It is not a de Polignac number, because 111021212110981 - 2¹ = 111021212110979 is a prime.

It is a super-2 number, since 2×111021212110981² (a number of 29 digits) contains 22 as substring.

Together with 111021212110979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111021212110951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510606055490 + 55510606055491.

It is an arithmetic number, because the mean of its divisors is an integer number (55510606055491).

Almost surely, 2^{111021212110981} is an apocalyptic number.

It is an amenable number.

111021212110981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021212110981 is an equidigital number, since it uses as much as digits as its factorization.

111021212110981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 31.

The spelling of 111021212110981 in words is "one hundred eleven trillion, twenty-one billion, two hundred twelve million, one hundred ten thousand, nine hundred eighty-one".