21736001 has 4 divisors (see below), whose sum is σ = 24841152. Its totient is φ = 18630852.

The previous prime is 21735937. The next prime is 21736003. The reversal of 21736001 is 10063712.

It is a happy number.

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 not a de Polignac number, because 21736001 - 2⁶ = 21735937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21736003) 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 3 ways as a sum of consecutive naturals, for example, 1552565 + ... + 1552578.

It is an arithmetic number, because the mean of its divisors is an integer number (6210288).

Almost surely, 2^21736001 is an apocalyptic number.

It is an amenable number.

21736001 is a deficient number, since it is larger than the sum of its proper divisors (3105151).

21736001 is an equidigital number, since it uses as much as digits as its factorization.

21736001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105150.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21736001 is about 4662.1884346302. The cubic root of 21736001 is about 279.0786082205.

Adding to 21736001 its reverse (10063712), we get a palindrome (31799713).

The spelling of 21736001 in words is "twenty-one million, seven hundred thirty-six thousand, one".