21332001 has 8 divisors (see below), whose sum is σ = 28515904. Its totient is φ = 14184720.

The previous prime is 21331993. The next prime is 21332009. The reversal of 21332001 is 10023312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21331993) and next prime (21332009).

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

It is not a de Polignac number, because 21332001 - 2³ = 21331993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7765 + ... + 10146.

It is an arithmetic number, because the mean of its divisors is an integer number (3564488).

Almost surely, 2^21332001 is an apocalyptic number.

It is an amenable number.

21332001 is a deficient number, since it is larger than the sum of its proper divisors (7183903).

21332001 is a wasteful number, since it uses less digits than its factorization.

21332001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18311.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21332001 is about 4618.6579219509. The cubic root of 21332001 is about 277.3387359429.

Adding to 21332001 its reverse (10023312), we get a palindrome (31355313).

The spelling of 21332001 in words is "twenty-one million, three hundred thirty-two thousand, one".