21212219983 has 2 divisors, whose sum is σ = 21212219984. Its totient is φ = 21212219982.

The previous prime is 21212219957. The next prime is 21212220011. The reversal of 21212219983 is 38991221212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212219983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222219983) 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 as a sum of consecutive naturals, namely, 10606109991 + 10606109992.

It is an arithmetic number, because the mean of its divisors is an integer number (10606109992).

Almost surely, 2^21212219983 is an apocalyptic number.

21212219983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212219983 is an equidigital number, since it uses as much as digits as its factorization.

21212219983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The spelling of 21212219983 in words is "twenty-one billion, two hundred twelve million, two hundred nineteen thousand, nine hundred eighty-three".