111212001001 has 2 divisors, whose sum is σ = 111212001002. Its totient is φ = 111212001000.

The previous prime is 111212000959. The next prime is 111212001011. The reversal of 111212001001 is 100100212111.

It is an a-pointer prime, because the next prime (111212001011) can be obtained adding 111212001001 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74463494400 + 36748506601 = 272880^2 + 191699^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212001001 - 2⁷ = 111212000873 is a prime.

It is not a weakly prime, because it can be changed into another prime (111212001011) 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 as a sum of consecutive naturals, namely, 55606000500 + 55606000501.

It is an arithmetic number, because the mean of its divisors is an integer number (55606000501).

Almost surely, 2^111212001001 is an apocalyptic number.

It is an amenable number.

111212001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212001001 is an equidigital number, since it uses as much as digits as its factorization.

111212001001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 111212001001 its reverse (100100212111), we get a palindrome (211312213112).

The spelling of 111212001001 in words is "one hundred eleven billion, two hundred twelve million, one thousand, one".