21232653 has 12 divisors (see below), whose sum is σ = 30656160. Its totient is φ = 13065936.

The previous prime is 21232639. The next prime is 21232663. The reversal of 21232653 is 35623212.

It is not a de Polignac number, because 21232653 - 2¹⁰ = 21231629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20433 + ... + 21446.

It is an arithmetic number, because the mean of its divisors is an integer number (2554680).

Almost surely, 2^21232653 is an apocalyptic number.

It is an amenable number.

21232653 is a deficient number, since it is larger than the sum of its proper divisors (9423507).

21232653 is a wasteful number, since it uses less digits than its factorization.

21232653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41908 (or 41895 counting only the distinct ones).

The product of its digits is 2160, while the sum is 24.

The square root of 21232653 is about 4607.8902981733. The cubic root of 21232653 is about 276.9075225535.

Adding to 21232653 its reverse (35623212), we get a palindrome (56855865).

The spelling of 21232653 in words is "twenty-one million, two hundred thirty-two thousand, six hundred fifty-three".