21103352 has 8 divisors (see below), whose sum is σ = 39568800. Its totient is φ = 10551672.

The previous prime is 21103339. The next prime is 21103363. The reversal of 21103352 is 25330112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21103352.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318952 + ... + 1318967.

It is an arithmetic number, because the mean of its divisors is an integer number (4946100).

Almost surely, 2^21103352 is an apocalyptic number.

It is an amenable number.

21103352 is a deficient number, since it is larger than the sum of its proper divisors (18465448).

21103352 is a wasteful number, since it uses less digits than its factorization.

21103352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2637925 (or 2637921 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21103352 is about 4593.8384821411. The cubic root of 21103352 is about 276.3442808624.

Adding to 21103352 its reverse (25330112), we get a palindrome (46433464).

The spelling of 21103352 in words is "twenty-one million, one hundred three thousand, three hundred fifty-two".