21836001 has 8 divisors (see below), whose sum is σ = 31761504. Its totient is φ = 13233920.

The previous prime is 21835981. The next prime is 21836011. The reversal of 21836001 is 10063812.

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

It is a cyclic number.

It is not a de Polignac number, because 21836001 - 2¹³ = 21827809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21836011) 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 7 ways as a sum of consecutive naturals, for example, 330816 + ... + 330881.

It is an arithmetic number, because the mean of its divisors is an integer number (3970188).

Almost surely, 2^21836001 is an apocalyptic number.

It is an amenable number.

21836001 is a deficient number, since it is larger than the sum of its proper divisors (9925503).

21836001 is a wasteful number, since it uses less digits than its factorization.

21836001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661711.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21836001 is about 4672.9007051295. The cubic root of 21836001 is about 279.5059357015.

Adding to 21836001 its reverse (10063812), we get a palindrome (31899813).

The spelling of 21836001 in words is "twenty-one million, eight hundred thirty-six thousand, one".