21459044 has 6 divisors (see below), whose sum is σ = 37553334. Its totient is φ = 10729520.

The previous prime is 21458989. The next prime is 21459073. The reversal of 21459044 is 44095412.

It can be written as a sum of positive squares in only one way, i.e., 17305600 + 4153444 = 4160^2 + 2038^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21458998 and 21459016.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2682377 + ... + 2682384.

It is an arithmetic number, because the mean of its divisors is an integer number (6258889).

Almost surely, 2^21459044 is an apocalyptic number.

It is an amenable number.

21459044 is a deficient number, since it is larger than the sum of its proper divisors (16094290).

21459044 is a wasteful number, since it uses less digits than its factorization.

21459044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5364765 (or 5364763 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21459044 is about 4632.3907434499. The cubic root of 21459044 is about 277.8882113553. Note that the first 3 decimals are identical.

The spelling of 21459044 in words is "twenty-one million, four hundred fifty-nine thousand, forty-four".