21433455 has 12 divisors (see below), whose sum is σ = 37151400. Its totient is φ = 11431152.

The previous prime is 21433453. The next prime is 21433469. The reversal of 21433455 is 55433412.

It is not a de Polignac number, because 21433455 - 2¹ = 21433453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238105 + ... + 238194.

It is an arithmetic number, because the mean of its divisors is an integer number (3095950).

Almost surely, 2^21433455 is an apocalyptic number.

21433455 is a deficient number, since it is larger than the sum of its proper divisors (15717945).

21433455 is a wasteful number, since it uses less digits than its factorization.

21433455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476310 (or 476307 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 21433455 is about 4629.6279548145. The cubic root of 21433455 is about 277.7777107852. Note that the first 4 decimals are identical.

Adding to 21433455 its reverse (55433412), we get a palindrome (76866867).

The spelling of 21433455 in words is "twenty-one million, four hundred thirty-three thousand, four hundred fifty-five".