21211229983 has 2 divisors, whose sum is σ = 21211229984. Its totient is φ = 21211229982.

The previous prime is 21211229981. The next prime is 21211230023. The reversal of 21211229983 is 38992211212.

It is an a-pointer prime, because the next prime (21211230023) can be obtained adding 21211229983 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211229983 - 2¹ = 21211229981 is a prime.

Together with 21211229981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211229981) 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 as a sum of consecutive naturals, namely, 10605614991 + 10605614992.

It is an arithmetic number, because the mean of its divisors is an integer number (10605614992).

Almost surely, 2^21211229983 is an apocalyptic number.

21211229983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211229983 is an equidigital number, since it uses as much as digits as its factorization.

21211229983 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 21211229983 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-nine thousand, nine hundred eighty-three".