21471789659 has 2 divisors, whose sum is σ = 21471789660. Its totient is φ = 21471789658.

The previous prime is 21471789653. The next prime is 21471789707. The reversal of 21471789659 is 95698717412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21471789659 - 2²⁸ = 21203354203 is a prime.

It is a super-2 number, since 2×21471789659² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21471789598 and 21471789607.

It is not a weakly prime, because it can be changed into another prime (21471789653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735894829 + 10735894830.

It is an arithmetic number, because the mean of its divisors is an integer number (10735894830).

Almost surely, 2^21471789659 is an apocalyptic number.

21471789659 is a deficient number, since it is larger than the sum of its proper divisors (1).

21471789659 is an equidigital number, since it uses as much as digits as its factorization.

21471789659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 59.

The spelling of 21471789659 in words is "twenty-one billion, four hundred seventy-one million, seven hundred eighty-nine thousand, six hundred fifty-nine".