21010232 has 16 divisors (see below), whose sum is σ = 41711760. Its totient is φ = 9887104.

The previous prime is 21010229. The next prime is 21010237. The reversal of 21010232 is 23201012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77108 + ... + 77379.

It is an arithmetic number, because the mean of its divisors is an integer number (2606985).

Almost surely, 2^21010232 is an apocalyptic number.

It is an amenable number.

21010232 is a deficient number, since it is larger than the sum of its proper divisors (20701528).

21010232 is a wasteful number, since it uses less digits than its factorization.

21010232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154510 (or 154506 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21010232 is about 4583.6919617269. The cubic root of 21010232 is about 275.9372187946.

Adding to 21010232 its reverse (23201012), we get a palindrome (44211244).

The spelling of 21010232 in words is "twenty-one million, ten thousand, two hundred thirty-two".