21233401 has 8 divisors (see below), whose sum is σ = 24494400. Its totient is φ = 18029328.

The previous prime is 21233389. The next prime is 21233411. The reversal of 21233401 is 10433212.

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 21233401 - 2⁵ = 21233369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21233411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13426 + ... + 14923.

It is an arithmetic number, because the mean of its divisors is an integer number (3061800).

Almost surely, 2^21233401 is an apocalyptic number.

It is an amenable number.

21233401 is a deficient number, since it is larger than the sum of its proper divisors (3260999).

21233401 is a wasteful number, since it uses less digits than its factorization.

21233401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28463.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21233401 is about 4607.9714625852. The cubic root of 21233401 is about 276.9107742180.

Adding to 21233401 its reverse (10433212), we get a palindrome (31666613).

The spelling of 21233401 in words is "twenty-one million, two hundred thirty-three thousand, four hundred one".