21320221283 has 2 divisors, whose sum is σ = 21320221284. Its totient is φ = 21320221282.

The previous prime is 21320221267. The next prime is 21320221327. The reversal of 21320221283 is 38212202312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21320221283 - 2⁴ = 21320221267 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21320251283) 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, 10660110641 + 10660110642.

It is an arithmetic number, because the mean of its divisors is an integer number (10660110642).

Almost surely, 2^21320221283 is an apocalyptic number.

21320221283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320221283 is an equidigital number, since it uses as much as digits as its factorization.

21320221283 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21320221283 its reverse (38212202312), we get a palindrome (59532423595).

The spelling of 21320221283 in words is "twenty-one billion, three hundred twenty million, two hundred twenty-one thousand, two hundred eighty-three".