21433001 has 4 divisors (see below), whose sum is σ = 22172100. Its totient is φ = 20693904.

The previous prime is 21432991. The next prime is 21433051. The reversal of 21433001 is 10033412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7295401 + 14137600 = 2701^2 + 3760^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433001 - 2¹⁸ = 21170857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21433051) 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, 369506 + ... + 369563.

It is an arithmetic number, because the mean of its divisors is an integer number (5543025).

Almost surely, 2^21433001 is an apocalyptic number.

It is an amenable number.

21433001 is a deficient number, since it is larger than the sum of its proper divisors (739099).

21433001 is an equidigital number, since it uses as much as digits as its factorization.

21433001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739098.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21433001 is about 4629.5789225371. The cubic root of 21433001 is about 277.7757494904.

Adding to 21433001 its reverse (10033412), we get a palindrome (31466413).

The spelling of 21433001 in words is "twenty-one million, four hundred thirty-three thousand, one".