11211011011987 has 2 divisors, whose sum is σ = 11211011011988. Its totient is φ = 11211011011986.

The previous prime is 11211011011969. The next prime is 11211011012029. The reversal of 11211011011987 is 78911011011211.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211011011987 is a prime.

It is not a weakly prime, because it can be changed into another prime (11211011411987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605505505993 + 5605505505994.

It is an arithmetic number, because the mean of its divisors is an integer number (5605505505994).

Almost surely, 2^{11211011011987} is an apocalyptic number.

11211011011987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211011011987 is an equidigital number, since it uses as much as digits as its factorization.

11211011011987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 34.

The spelling of 11211011011987 in words is "eleven trillion, two hundred eleven billion, eleven million, eleven thousand, nine hundred eighty-seven".