1212101987 has 4 divisors (see below), whose sum is σ = 1212250296. Its totient is φ = 1211953680.

The previous prime is 1212101963. The next prime is 1212102013. The reversal of 1212101987 is 7891012121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7891012121 = 3947 ⋅1999243.

It is a cyclic number.

It is not a de Polignac number, because 1212101987 - 2⁶ = 1212101923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212101287) 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, 61133 + ... + 78494.

It is an arithmetic number, because the mean of its divisors is an integer number (303062574).

Almost surely, 2^1212101987 is an apocalyptic number.

1212101987 is a deficient number, since it is larger than the sum of its proper divisors (148309).

1212101987 is an equidigital number, since it uses as much as digits as its factorization.

1212101987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148308.

The product of its (nonzero) digits is 2016, while the sum is 32.

The square root of 1212101987 is about 34815.2550902618. The cubic root of 1212101987 is about 1066.2189272001.

The spelling of 1212101987 in words is "one billion, two hundred twelve million, one hundred one thousand, nine hundred eighty-seven".