12122020987 has 4 divisors (see below), whose sum is σ = 12258223560. Its totient is φ = 11985818416.

The previous prime is 12122020961. The next prime is 12122021017. The reversal of 12122020987 is 78902022121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12122020987 - 2²³ = 12113632379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12122020787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68101153 + ... + 68101330.

It is an arithmetic number, because the mean of its divisors is an integer number (3064555890).

Almost surely, 2^12122020987 is an apocalyptic number.

12122020987 is a deficient number, since it is larger than the sum of its proper divisors (136202573).

12122020987 is an equidigital number, since it uses as much as digits as its factorization.

12122020987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136202572.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 12122020987 in words is "twelve billion, one hundred twenty-two million, twenty thousand, nine hundred eighty-seven".