21212120183 has 2 divisors, whose sum is σ = 21212120184. Its totient is φ = 21212120182.

The previous prime is 21212120177. The next prime is 21212120257. The reversal of 21212120183 is 38102121212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212120183 - 2²⁶ = 21145011319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212120123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606060091 + 10606060092.

It is an arithmetic number, because the mean of its divisors is an integer number (10606060092).

Almost surely, 2^21212120183 is an apocalyptic number.

21212120183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212120183 is an equidigital number, since it uses as much as digits as its factorization.

21212120183 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21212120183 its reverse (38102121212), we get a palindrome (59314241395).

The spelling of 21212120183 in words is "twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred eighty-three".