21736045 has 8 divisors (see below), whose sum is σ = 26108280. Its totient is φ = 17372160.

The previous prime is 21736037. The next prime is 21736067. The reversal of 21736045 is 54063712.

It can be written as a sum of positive squares in 4 ways, for example, as 4588164 + 17147881 = 2142^2 + 4141^2 .

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

It is not a de Polignac number, because 21736045 - 2³ = 21736037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9361 + ... + 11449.

It is an arithmetic number, because the mean of its divisors is an integer number (3263535).

Almost surely, 2^21736045 is an apocalyptic number.

It is an amenable number.

21736045 is a deficient number, since it is larger than the sum of its proper divisors (4372235).

21736045 is a wasteful number, since it uses less digits than its factorization.

21736045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21736045 is about 4662.1931534418. The cubic root of 21736045 is about 279.0787965325.

Adding to 21736045 its reverse (54063712), we get a palindrome (75799757).

The spelling of 21736045 in words is "twenty-one million, seven hundred thirty-six thousand, forty-five".