21216030011489 has 2 divisors, whose sum is σ = 21216030011490. Its totient is φ = 21216030011488.

The previous prime is 21216030011441. The next prime is 21216030011509. The reversal of 21216030011489 is 98411003061212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18646998059089 + 2569031952400 = 4318217^2 + 1602820^2 .

It is a cyclic number.

It is not a de Polignac number, because 21216030011489 - 2¹⁶ = 21216029945953 is a prime.

It is not a weakly prime, because it can be changed into another prime (21216030011389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10608015005744 + 10608015005745.

It is an arithmetic number, because the mean of its divisors is an integer number (10608015005745).

Almost surely, 2^{21216030011489} is an apocalyptic number.

It is an amenable number.

21216030011489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21216030011489 is an equidigital number, since it uses as much as digits as its factorization.

21216030011489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 21216030011489 in words is "twenty-one trillion, two hundred sixteen billion, thirty million, eleven thousand, four hundred eighty-nine".