1212210201999 has 4 divisors (see below), whose sum is σ = 1616280269336. Its totient is φ = 808140134664.

The previous prime is 1212210201941. The next prime is 1212210202001. The reversal of 1212210201999 is 9991020122121.

It is a happy number.

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

It is not a de Polignac number, because 1212210201999 - 2¹¹ = 1212210199951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212210201919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202035033664 + ... + 202035033669.

It is an arithmetic number, because the mean of its divisors is an integer number (404070067334).

Almost surely, 2^{1212210201999} is an apocalyptic number.

1212210201999 is a deficient number, since it is larger than the sum of its proper divisors (404070067337).

1212210201999 is an equidigital number, since it uses as much as digits as its factorization.

1212210201999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404070067336.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 1212210201999 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred one thousand, nine hundred ninety-nine".