111021121087 has 2 divisors, whose sum is σ = 111021121088. Its totient is φ = 111021121086.

The previous prime is 111021121069. The next prime is 111021121181. The reversal of 111021121087 is 780121120111.

It is a weak prime.

It is an emirp because it is prime and its reverse (780121120111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111021121087 - 2¹⁵ = 111021088319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111021121037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510560543 + 55510560544.

It is an arithmetic number, because the mean of its divisors is an integer number (55510560544).

Almost surely, 2^111021121087 is an apocalyptic number.

111021121087 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021121087 is an equidigital number, since it uses as much as digits as its factorization.

111021121087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 25.

Adding to 111021121087 its reverse (780121120111), we get a palindrome (891142241198).

The spelling of 111021121087 in words is "one hundred eleven billion, twenty-one million, one hundred twenty-one thousand, eighty-seven".