21485089 has 2 divisors, whose sum is σ = 21485090. Its totient is φ = 21485088.

The previous prime is 21485083. The next prime is 21485111. The reversal of 21485089 is 98058412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12723489 + 8761600 = 3567^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 21485089 - 2¹⁷ = 21354017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21485083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742544 + 10742545.

It is an arithmetic number, because the mean of its divisors is an integer number (10742545).

Almost surely, 2^21485089 is an apocalyptic number.

It is an amenable number.

21485089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21485089 is an equidigital number, since it uses as much as digits as its factorization.

21485089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 21485089 is about 4635.2010743872. The cubic root of 21485089 is about 278.0005908929. Note that the first 3 decimals are identical.

The spelling of 21485089 in words is "twenty-one million, four hundred eighty-five thousand, eighty-nine".