21033552 has 40 divisors (see below), whose sum is σ = 54550080. Its totient is φ = 6983680.

The previous prime is 21033541. The next prime is 21033557. The reversal of 21033552 is 25533012.

21033552 is nontrivially palindromic in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033557) 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, 14224 + ... + 15632.

It is an arithmetic number, because the mean of its divisors is an integer number (1363752).

Almost surely, 2^21033552 is an apocalyptic number.

It is an amenable number.

21033552 is an abundant number, since it is smaller than the sum of its proper divisors (33516528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21033552 is a wasteful number, since it uses less digits than its factorization.

21033552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 21033552 is about 4586.2350572120. The cubic root of 21033552 is about 276.0392718745.

Adding to 21033552 its reverse (25533012), we get a palindrome (46566564).

The spelling of 21033552 in words is "twenty-one million, thirty-three thousand, five hundred fifty-two".