21475028089 has 2 divisors, whose sum is σ = 21475028090. Its totient is φ = 21475028088.

The previous prime is 21475028087. The next prime is 21475028117. The reversal of 21475028089 is 98082057412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20083141225 + 1391886864 = 141715^2 + 37308^2 .

It is a cyclic number.

It is not a de Polignac number, because 21475028089 - 2¹ = 21475028087 is a prime.

It is a super-2 number, since 2×21475028089² (a number of 21 digits) contains 22 as substring.

Together with 21475028087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21475028087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10737514044 + 10737514045.

It is an arithmetic number, because the mean of its divisors is an integer number (10737514045).

Almost surely, 2^21475028089 is an apocalyptic number.

It is an amenable number.

21475028089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21475028089 is an equidigital number, since it uses as much as digits as its factorization.

21475028089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 21475028089 in words is "twenty-one billion, four hundred seventy-five million, twenty-eight thousand, eighty-nine".