101221111987 has 2 divisors, whose sum is σ = 101221111988. Its totient is φ = 101221111986.

The previous prime is 101221111967. The next prime is 101221112011. The reversal of 101221111987 is 789111122101.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (789111122101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101221111987 is a prime.

It is not a weakly prime, because it can be changed into another prime (101221111967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610555993 + 50610555994.

It is an arithmetic number, because the mean of its divisors is an integer number (50610555994).

Almost surely, 2^101221111987 is an apocalyptic number.

101221111987 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221111987 is an equidigital number, since it uses as much as digits as its factorization.

101221111987 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 101221111987 in words is "one hundred one billion, two hundred twenty-one million, one hundred eleven thousand, nine hundred eighty-seven".