21589474 has 8 divisors (see below), whose sum is σ = 32464620. Its totient is φ = 10767936.

The previous prime is 21589471. The next prime is 21589481. The reversal of 21589474 is 47498512.

It can be written as a sum of positive squares in 2 ways, for example, as 20638849 + 950625 = 4543^2 + 975^2 .

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

It is a super-2 number, since 2×21589474² = 932210775193352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21589471) 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 3 ways as a sum of consecutive naturals, for example, 12379 + ... + 14014.

Almost surely, 2^21589474 is an apocalyptic number.

21589474 is a deficient number, since it is larger than the sum of its proper divisors (10875146).

21589474 is a wasteful number, since it uses less digits than its factorization.

21589474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26804.

The product of its digits is 80640, while the sum is 40.

The square root of 21589474 is about 4646.4474601571. The cubic root of 21589474 is about 278.4500843663.

The spelling of 21589474 in words is "twenty-one million, five hundred eighty-nine thousand, four hundred seventy-four".