21433401 has 24 divisors (see below), whose sum is σ = 35246016.
Its totient is φ = 12423840.
The previous prime is 21433361. The next prime is 21433417. The reversal of 21433401 is 10433412.
It is not a de Polignac number, because 21433401 - 211 = 21431353 is a prime.
It is not an unprimeable number, because it can be changed into a prime (21433421) 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 23 ways as a sum of consecutive naturals, for example, 2430 + ... + 6983.
It is an arithmetic number, because the mean of its divisors is an integer number (1468584).
Almost surely, 221433401 is an apocalyptic number.
It is an amenable number.
21433401 is a deficient number, since it is larger than the sum of its proper divisors (13812615).
21433401 is a wasteful number, since it uses less digits than its factorization.
21433401 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 9453 (or 9450 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 18.
The square root of 21433401 is about 4629.6221228087.
The cubic root of 21433401 is about 277.7774775049.
Note that the first 3 decimals are identical.
Adding to 21433401 its reverse (10433412), we get a palindrome (31866813).
The spelling of 21433401 in words is "twenty-one million, four hundred thirty-three thousand, four hundred one".