221212210099 has 4 divisors (see below), whose sum is σ = 234224693064. Its totient is φ = 208199727136.

The previous prime is 221212210067. The next prime is 221212210103. The reversal of 221212210099 is 990012212122.

221212210099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221212210099 - 2⁵ = 221212210067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221212210099.

It is not an unprimeable number, because it can be changed into a prime (221212250099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6506241457 + ... + 6506241490.

It is an arithmetic number, because the mean of its divisors is an integer number (58556173266).

Almost surely, 2^221212210099 is an apocalyptic number.

221212210099 is a deficient number, since it is larger than the sum of its proper divisors (13012482965).

221212210099 is a wasteful number, since it uses less digits than its factorization.

221212210099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13012482964.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 221212210099 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, ninety-nine".