21216403309483 has 2 divisors, whose sum is σ = 21216403309484. Its totient is φ = 21216403309482.

The previous prime is 21216403309477. The next prime is 21216403309537. The reversal of 21216403309483 is 38490330461212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21216403309483 is a prime.

It is not a weakly prime, because it can be changed into another prime (21216403309463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10608201654741 + 10608201654742.

It is an arithmetic number, because the mean of its divisors is an integer number (10608201654742).

Almost surely, 2^{21216403309483} is an apocalyptic number.

21216403309483 is a deficient number, since it is larger than the sum of its proper divisors (1).

21216403309483 is an equidigital number, since it uses as much as digits as its factorization.

21216403309483 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 21216403309483 in words is "twenty-one trillion, two hundred sixteen billion, four hundred three million, three hundred nine thousand, four hundred eighty-three".