21033436 has 12 divisors (see below), whose sum is σ = 37056600. Its totient is φ = 10445840.

The previous prime is 21033433. The next prime is 21033443. The reversal of 21033436 is 63433012.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 17050 + ... + 18241.

It is an arithmetic number, because the mean of its divisors is an integer number (3088050).

Almost surely, 2^21033436 is an apocalyptic number.

It is an amenable number.

21033436 is a deficient number, since it is larger than the sum of its proper divisors (16023164).

21033436 is a wasteful number, since it uses less digits than its factorization.

21033436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35444 (or 35442 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 21033436 is about 4586.2224106556. Note that the first 3 decimals coincide. The cubic root of 21033436 is about 276.0387644215.

Adding to 21033436 its reverse (63433012), we get a palindrome (84466448).

The spelling of 21033436 in words is "twenty-one million, thirty-three thousand, four hundred thirty-six".