101111221987 has 2 divisors, whose sum is σ = 101111221988. Its totient is φ = 101111221986.

The previous prime is 101111221933. The next prime is 101111221993. The reversal of 101111221987 is 789122111101.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101111221987 is a prime.

It is a super-4 number, since 4×101111221987⁴ (a number of 45 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (101111221787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50555610993 + 50555610994.

It is an arithmetic number, because the mean of its divisors is an integer number (50555610994).

Almost surely, 2^101111221987 is an apocalyptic number.

101111221987 is a deficient number, since it is larger than the sum of its proper divisors (1).

101111221987 is an equidigital number, since it uses as much as digits as its factorization.

101111221987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 34.

The spelling of 101111221987 in words is "one hundred one billion, one hundred eleven million, two hundred twenty-one thousand, nine hundred eighty-seven".