21583045 has 16 divisors (see below), whose sum is σ = 28680768. Its totient is φ = 15459840.

The previous prime is 21583043. The next prime is 21583063. The reversal of 21583045 is 54038512.

It is not a de Polignac number, because 21583045 - 2¹ = 21583043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21583043) 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 15 ways as a sum of consecutive naturals, for example, 757 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (1792548).

Almost surely, 2^21583045 is an apocalyptic number.

It is an amenable number.

21583045 is a deficient number, since it is larger than the sum of its proper divisors (7097723).

21583045 is a wasteful number, since it uses less digits than its factorization.

21583045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5940.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 21583045 is about 4645.7555897830. The cubic root of 21583045 is about 278.4224422954.

The spelling of 21583045 in words is "twenty-one million, five hundred eighty-three thousand, forty-five".