18211101212 has 24 divisors (see below), whose sum is σ = 32088979104. Its totient is φ = 9043034112.

The previous prime is 18211101211. The next prime is 18211101217. The reversal of 18211101212 is 21210111281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211101211) 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 7 ways as a sum of consecutive naturals, for example, 320153 + ... + 372719.

It is an arithmetic number, because the mean of its divisors is an integer number (1337040796).

Almost surely, 2^18211101212 is an apocalyptic number.

It is an amenable number.

18211101212 is a deficient number, since it is larger than the sum of its proper divisors (13877877892).

18211101212 is a wasteful number, since it uses less digits than its factorization.

18211101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53165 (or 53163 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 18211101212 its reverse (21210111281), we get a palindrome (39421212493).

The spelling of 18211101212 in words is "eighteen billion, two hundred eleven million, one hundred one thousand, two hundred twelve".