1212421209999 has 32 divisors (see below), whose sum is σ = 1713138535680. Its totient is φ = 761394670848.

The previous prime is 1212421209997. The next prime is 1212421210009. The reversal of 1212421209999 is 9999021242121.

It is a Cunningham number, because it is equal to 1101100²-1.

It is not a de Polignac number, because 1212421209999 - 2¹ = 1212421209997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212421209997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3119787 + ... + 3486819.

It is an arithmetic number, because the mean of its divisors is an integer number (53535579240).

Almost surely, 2^{1212421209999} is an apocalyptic number.

1212421209999 is a deficient number, since it is larger than the sum of its proper divisors (500717325681).

1212421209999 is a wasteful number, since it uses less digits than its factorization.

1212421209999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367991.

The product of its (nonzero) digits is 419904, while the sum is 51.

The spelling of 1212421209999 in words is "one trillion, two hundred twelve billion, four hundred twenty-one million, two hundred nine thousand, nine hundred ninety-nine".