21033001 has 8 divisors (see below), whose sum is σ = 22989600. Its totient is φ = 19083840.

The previous prime is 21032993. The next prime is 21033007. The reversal of 21033001 is 10033012.

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 21033001 - 2³ = 21032993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5265 + ... + 8353.

It is an arithmetic number, because the mean of its divisors is an integer number (2873700).

Almost surely, 2^21033001 is an apocalyptic number.

It is an amenable number.

21033001 is a deficient number, since it is larger than the sum of its proper divisors (1956599).

21033001 is a wasteful number, since it uses less digits than its factorization.

21033001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3719.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21033001 is about 4586.1749857588. The cubic root of 21033001 is about 276.0368614563.

Adding to 21033001 its reverse (10033012), we get a palindrome (31066013).

The spelling of 21033001 in words is "twenty-one million, thirty-three thousand, one".