21509885483 has 2 divisors, whose sum is σ = 21509885484. Its totient is φ = 21509885482.

The previous prime is 21509885429. The next prime is 21509885513. The reversal of 21509885483 is 38458890512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21509885483 - 2¹² = 21509881387 is a prime.

It is not a weakly prime, because it can be changed into another prime (21509885413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10754942741 + 10754942742.

It is an arithmetic number, because the mean of its divisors is an integer number (10754942742).

Almost surely, 2^21509885483 is an apocalyptic number.

21509885483 is a deficient number, since it is larger than the sum of its proper divisors (1).

21509885483 is an equidigital number, since it uses as much as digits as its factorization.

21509885483 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2764800, while the sum is 53.

The spelling of 21509885483 in words is "twenty-one billion, five hundred nine million, eight hundred eighty-five thousand, four hundred eighty-three".