21212199983827 has 2 divisors, whose sum is σ = 21212199983828. Its totient is φ = 21212199983826.

The previous prime is 21212199983813. The next prime is 21212199983831. The reversal of 21212199983827 is 72838999121212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212199983827 - 2⁷ = 21212199983699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212199963827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606099991913 + 10606099991914.

It is an arithmetic number, because the mean of its divisors is an integer number (10606099991914).

Almost surely, 2^{21212199983827} is an apocalyptic number.

21212199983827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212199983827 is an equidigital number, since it uses as much as digits as its factorization.

21212199983827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 64.

The spelling of 21212199983827 in words is "twenty-one trillion, two hundred twelve billion, one hundred ninety-nine million, nine hundred eighty-three thousand, eight hundred twenty-seven".