11212120987 has 4 divisors (see below), whose sum is σ = 11370038256. Its totient is φ = 11054203720.

The previous prime is 11212120981. The next prime is 11212121017. The reversal of 11212120987 is 78902121211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78902121211 = 11743 ⋅6719077.

It is a cyclic number.

It is not a de Polignac number, because 11212120987 - 2³ = 11212120979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11212120981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78958528 + ... + 78958669.

It is an arithmetic number, because the mean of its divisors is an integer number (2842509564).

Almost surely, 2^11212120987 is an apocalyptic number.

11212120987 is a deficient number, since it is larger than the sum of its proper divisors (157917269).

11212120987 is an equidigital number, since it uses as much as digits as its factorization.

11212120987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157917268.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 11212120987 in words is "eleven billion, two hundred twelve million, one hundred twenty thousand, nine hundred eighty-seven".