21589450 has 24 divisors (see below), whose sum is σ = 41015232. Its totient is φ = 8451120.

The previous prime is 21589409. The next prime is 21589459. The reversal of 21589450 is 5498512.

It is a super-2 number, since 2×21589450² = 932208702605000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21589459) 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 11 ways as a sum of consecutive naturals, for example, 2244 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (1708968).

Almost surely, 2^21589450 is an apocalyptic number.

21589450 is a deficient number, since it is larger than the sum of its proper divisors (19425782).

21589450 is a wasteful number, since it uses less digits than its factorization.

21589450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9246 (or 9241 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 21589450 is about 4646.4448775381. Note that the first 3 decimals coincide. The cubic root of 21589450 is about 278.4499811863.

The spelling of 21589450 in words is "twenty-one million, five hundred eighty-nine thousand, four hundred fifty".