21212212199 has 4 divisors (see below), whose sum is σ = 22328644440. Its totient is φ = 20095779960.

The previous prime is 21212212193. The next prime is 21212212201. The reversal of 21212212199 is 99121221212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212212199 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 (21212212193) 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, 558216092 + ... + 558216129.

It is an arithmetic number, because the mean of its divisors is an integer number (5582161110).

Almost surely, 2^21212212199 is an apocalyptic number.

21212212199 is a deficient number, since it is larger than the sum of its proper divisors (1116432241).

21212212199 is a wasteful number, since it uses less digits than its factorization.

21212212199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116432240.

The product of its digits is 2592, while the sum is 32.

The spelling of 21212212199 in words is "twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred ninety-nine".