1212120111987 has 14 divisors (see below), whose sum is σ = 1817348810972. Its totient is φ = 808080074172.

The previous prime is 1212120111967. The next prime is 1212120112031. The reversal of 1212120111987 is 7891110212121.

It is not a de Polignac number, because 1212120111987 - 2¹¹ = 1212120109939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212120111967) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 831357373 + ... + 831358830.

Almost surely, 2^{1212120111987} is an apocalyptic number.

1212120111987 is a deficient number, since it is larger than the sum of its proper divisors (605228698985).

1212120111987 is an frugal number, since it uses more digits than its factorization.

1212120111987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662716221 (or 1662716206 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 36.

The spelling of 1212120111987 in words is "one trillion, two hundred twelve billion, one hundred twenty million, one hundred eleven thousand, nine hundred eighty-seven".