21416829533987 has 2 divisors, whose sum is σ = 21416829533988. Its totient is φ = 21416829533986.

The previous prime is 21416829533977. The next prime is 21416829534011. The reversal of 21416829533987 is 78933592861412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21416829533987 - 2²⁰ = 21416828485411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21416829533917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708414766993 + 10708414766994.

It is an arithmetic number, because the mean of its divisors is an integer number (10708414766994).

Almost surely, 2^{21416829533987} is an apocalyptic number.

21416829533987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21416829533987 is an equidigital number, since it uses as much as digits as its factorization.

21416829533987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156764160, while the sum is 68.

The spelling of 21416829533987 in words is "twenty-one trillion, four hundred sixteen billion, eight hundred twenty-nine million, five hundred thirty-three thousand, nine hundred eighty-seven".