21212200199 has 4 divisors (see below), whose sum is σ = 21220518000. Its totient is φ = 21203882400.

The previous prime is 21212200187. The next prime is 21212200253. The reversal of 21212200199 is 99100221212.

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-21212200199 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 (21212205199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4155074 + ... + 4160175.

It is an arithmetic number, because the mean of its divisors is an integer number (5305129500).

Almost surely, 2^21212200199 is an apocalyptic number.

21212200199 is a deficient number, since it is larger than the sum of its proper divisors (8317801).

21212200199 is an equidigital number, since it uses as much as digits as its factorization.

21212200199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8317800.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 21212200199 in words is "twenty-one billion, two hundred twelve million, two hundred thousand, one hundred ninety-nine".