21675037 has 4 divisors (see below), whose sum is σ = 22136256. Its totient is φ = 21213820.

The previous prime is 21675013. The next prime is 21675041. The reversal of 21675037 is 73057612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21675037 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675047) 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, 230539 + ... + 230632.

It is an arithmetic number, because the mean of its divisors is an integer number (5534064).

Almost surely, 2^21675037 is an apocalyptic number.

It is an amenable number.

21675037 is a deficient number, since it is larger than the sum of its proper divisors (461219).

21675037 is an equidigital number, since it uses as much as digits as its factorization.

21675037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461218.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 21675037 is about 4655.6457124657. The cubic root of 21675037 is about 278.8174488728.

The spelling of 21675037 in words is "twenty-one million, six hundred seventy-five thousand, thirty-seven".