21089467 has 8 divisors (see below), whose sum is σ = 24933600. Its totient is φ = 17453184.

The previous prime is 21089437. The next prime is 21089473. The reversal of 21089467 is 76498012.

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

It is not a de Polignac number, because 21089467 - 2¹¹ = 21087419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21089407) 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 in 7 ways as a sum of consecutive naturals, for example, 51742 + ... + 52147.

It is an arithmetic number, because the mean of its divisors is an integer number (3116700).

Almost surely, 2^21089467 is an apocalyptic number.

21089467 is a deficient number, since it is larger than the sum of its proper divisors (3844133).

21089467 is a wasteful number, since it uses less digits than its factorization.

21089467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103925.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21089467 is about 4592.3269700665. The cubic root of 21089467 is about 276.2836604425.

The spelling of 21089467 in words is "twenty-one million, eighty-nine thousand, four hundred sixty-seven".