21212201211999 has 48 divisors (see below), whose sum is σ = 34510760570880. Its totient is φ = 11533543412160.

The previous prime is 21212201211989. The next prime is 21212201212009. The reversal of 21212201211999 is 99911210221212.

It is an interprime number because it is at equal distance from previous prime (21212201211989) and next prime (21212201212009).

It is not a de Polignac number, because 21212201211999 - 2²³ = 21212192823391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21212201211999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212201211989) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15778164 + ... + 17069705.

It is an arithmetic number, because the mean of its divisors is an integer number (718974178560).

Almost surely, 2^{21212201211999} is an apocalyptic number.

21212201211999 is a deficient number, since it is larger than the sum of its proper divisors (13298559358881).

21212201211999 is a wasteful number, since it uses less digits than its factorization.

21212201211999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32848100 (or 32848093 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 42.

The spelling of 21212201211999 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, two hundred eleven thousand, nine hundred ninety-nine".