21433430 has 16 divisors (see below), whose sum is σ = 40849920. Its totient is φ = 8068992.

The previous prime is 21433427. The next prime is 21433439. The reversal of 21433430 is 3433412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433439) 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 7 ways as a sum of consecutive naturals, for example, 62870 + ... + 63209.

It is an arithmetic number, because the mean of its divisors is an integer number (2553120).

Almost surely, 2^21433430 is an apocalyptic number.

21433430 is a deficient number, since it is larger than the sum of its proper divisors (19416490).

21433430 is a wasteful number, since it uses less digits than its factorization.

21433430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126103.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 21433430 is about 4629.6252548127. The cubic root of 21433430 is about 277.7776027851. Note that the first 3 decimals are identical.

Adding to 21433430 its reverse (3433412), we get a palindrome (24866842).

The spelling of 21433430 in words is "twenty-one million, four hundred thirty-three thousand, four hundred thirty".