1212120087 has 4 divisors (see below), whose sum is σ = 1616160120. Its totient is φ = 808080056.

The previous prime is 1212120071. The next prime is 1212120097. The reversal of 1212120087 is 7800212121.

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 1212120087 - 2⁴ = 1212120071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212120097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202020012 + ... + 202020017.

It is an arithmetic number, because the mean of its divisors is an integer number (404040030).

Almost surely, 2^1212120087 is an apocalyptic number.

1212120087 is a deficient number, since it is larger than the sum of its proper divisors (404040033).

1212120087 is an equidigital number, since it uses as much as digits as its factorization.

1212120087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404040032.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 1212120087 is about 34815.5150328126. The cubic root of 1212120087 is about 1066.2242343626.

The spelling of 1212120087 in words is "one billion, two hundred twelve million, one hundred twenty thousand, eighty-seven".