21435089 has 8 divisors (see below), whose sum is σ = 23880360. Its totient is φ = 19103616.

The previous prime is 21435077. The next prime is 21435101. The reversal of 21435089 is 98053412.

It is an interprime number because it is at equal distance from previous prime (21435077) and next prime (21435101).

It can be written as a sum of positive squares in 4 ways, for example, as 577600 + 20857489 = 760^2 + 4567^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21435089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21435019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28052 + ... + 28805.

It is an arithmetic number, because the mean of its divisors is an integer number (2985045).

Almost surely, 2^21435089 is an apocalyptic number.

21435089 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21435089 is a deficient number, since it is larger than the sum of its proper divisors (2445271).

21435089 is a wasteful number, since it uses less digits than its factorization.

21435089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56899.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 21435089 is about 4629.8044235151. The cubic root of 21435089 is about 277.7847694892.

The spelling of 21435089 in words is "twenty-one million, four hundred thirty-five thousand, eighty-nine".