21033434 has 16 divisors (see below), whose sum is σ = 32140800. Its totient is φ = 10321584.

The previous prime is 21033433. The next prime is 21033443. The reversal of 21033434 is 43433012.

It is not an unprimeable number, because it can be changed into a prime (21033433) 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, 37484 + ... + 38040.

It is an arithmetic number, because the mean of its divisors is an integer number (2008800).

Almost surely, 2^21033434 is an apocalyptic number.

21033434 is a deficient number, since it is larger than the sum of its proper divisors (11107366).

21033434 is a wasteful number, since it uses less digits than its factorization.

21033434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877.

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

The square root of 21033434 is about 4586.2221926113. Note that the first 3 decimals coincide. The cubic root of 21033434 is about 276.0387556723.

Adding to 21033434 its reverse (43433012), we get a palindrome (64466446).

The spelling of 21033434 in words is "twenty-one million, thirty-three thousand, four hundred thirty-four".