21523352 has 16 divisors (see below), whose sum is σ = 42480600. Its totient is φ = 10195200.

The previous prime is 21523351. The next prime is 21523361. The reversal of 21523352 is 25332512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523351) 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 3 ways as a sum of consecutive naturals, for example, 70649 + ... + 70952.

Almost surely, 2^21523352 is an apocalyptic number.

It is an amenable number.

21523352 is a deficient number, since it is larger than the sum of its proper divisors (20957248).

21523352 is a wasteful number, since it uses less digits than its factorization.

21523352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141626 (or 141622 counting only the distinct ones).

The product of its digits is 1800, while the sum is 23.

The square root of 21523352 is about 4639.3266752838. The cubic root of 21523352 is about 278.1655243228.

Adding to 21523352 its reverse (25332512), we get a palindrome (46855864).

The spelling of 21523352 in words is "twenty-one million, five hundred twenty-three thousand, three hundred fifty-two".