21003320111971 has 2 divisors, whose sum is σ = 21003320111972. Its totient is φ = 21003320111970.

The previous prime is 21003320111959. The next prime is 21003320112023. The reversal of 21003320111971 is 17911102330012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21003320111971 - 2²⁹ = 21002783241059 is a prime.

It is a super-2 number, since 2×21003320111971² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21003320171971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501660055985 + 10501660055986.

It is an arithmetic number, because the mean of its divisors is an integer number (10501660055986).

Almost surely, 2^{21003320111971} is an apocalyptic number.

21003320111971 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003320111971 is an equidigital number, since it uses as much as digits as its factorization.

21003320111971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

Adding to 21003320111971 its reverse (17911102330012), we get a palindrome (38914422441983).

The spelling of 21003320111971 in words is "twenty-one trillion, three billion, three hundred twenty million, one hundred eleven thousand, nine hundred seventy-one".