21212012209999 has 8 divisors (see below), whose sum is σ = 22846231703792. Its totient is φ = 19578153608640.

The previous prime is 21212012209991. The next prime is 21212012210017. The reversal of 21212012209999 is 99990221021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212012209999 - 2³ = 21212012209991 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 (21212012209991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90101022 + ... + 90336139.

It is an arithmetic number, because the mean of its divisors is an integer number (2855778962974).

Almost surely, 2^{21212012209999} is an apocalyptic number.

21212012209999 is a deficient number, since it is larger than the sum of its proper divisors (1634219493793).

21212012209999 is a wasteful number, since it uses less digits than its factorization.

21212012209999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180446217.

The product of its (nonzero) digits is 209952, while the sum is 49.

The spelling of 21212012209999 in words is "twenty-one trillion, two hundred twelve billion, twelve million, two hundred nine thousand, nine hundred ninety-nine".