21232001 has 8 divisors (see below), whose sum is σ = 24488640. Its totient is φ = 18031248.

The previous prime is 21231979. The next prime is 21232007. The reversal of 21232001 is 10023212.

It is a happy number.

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 21232001 - 2⁶ = 21231937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232007) 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, 13151 + ... + 14676.

It is an arithmetic number, because the mean of its divisors is an integer number (3061080).

Almost surely, 2^21232001 is an apocalyptic number.

It is an amenable number.

21232001 is a deficient number, since it is larger than the sum of its proper divisors (3256639).

21232001 is a wasteful number, since it uses less digits than its factorization.

21232001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27943.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21232001 is about 4607.8195494181. The cubic root of 21232001 is about 276.9046881526.

Adding to 21232001 its reverse (10023212), we get a palindrome (31255213).

The spelling of 21232001 in words is "twenty-one million, two hundred thirty-two thousand, one".