21033446 has 16 divisors (see below), whose sum is σ = 36794400. Its totient is φ = 9014040.

The previous prime is 21033443. The next prime is 21033461. The reversal of 21033446 is 64433012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033443) 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, 14645 + ... + 16016.

It is an arithmetic number, because the mean of its divisors is an integer number (2299650).

Almost surely, 2^21033446 is an apocalyptic number.

21033446 is a deficient number, since it is larger than the sum of its proper divisors (15760954).

21033446 is an equidigital number, since it uses as much as digits as its factorization.

21033446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30684 (or 30670 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 21033446 is about 4586.2235008774. The cubic root of 21033446 is about 276.0388081675.

Adding to 21033446 its reverse (64433012), we get a palindrome (85466458).

The spelling of 21033446 in words is "twenty-one million, thirty-three thousand, four hundred forty-six".