21417514021 has 2 divisors, whose sum is σ = 21417514022. Its totient is φ = 21417514020.

The previous prime is 21417514009. The next prime is 21417514037. The reversal of 21417514021 is 12041571412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15948911521 + 5468602500 = 126289^2 + 73950^2 .

It is a cyclic number.

It is not a de Polignac number, because 21417514021 - 2²⁹ = 20880643109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21417514051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708757010 + 10708757011.

It is an arithmetic number, because the mean of its divisors is an integer number (10708757011).

Almost surely, 2^21417514021 is an apocalyptic number.

It is an amenable number.

21417514021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21417514021 is an equidigital number, since it uses as much as digits as its factorization.

21417514021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The spelling of 21417514021 in words is "twenty-one billion, four hundred seventeen million, five hundred fourteen thousand, twenty-one".