111220121087 has 2 divisors, whose sum is σ = 111220121088. Its totient is φ = 111220121086.

The previous prime is 111220121059. The next prime is 111220121227. The reversal of 111220121087 is 780121022111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111220121087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111220121587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610060543 + 55610060544.

It is an arithmetic number, because the mean of its divisors is an integer number (55610060544).

Almost surely, 2^111220121087 is an apocalyptic number.

111220121087 is a deficient number, since it is larger than the sum of its proper divisors (1).

111220121087 is an equidigital number, since it uses as much as digits as its factorization.

111220121087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 26.

Adding to 111220121087 its reverse (780121022111), we get a palindrome (891341143198).

The spelling of 111220121087 in words is "one hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, eighty-seven".