21032650 has 24 divisors (see below), whose sum is σ = 40181580. Its totient is φ = 8184960.

The previous prime is 21032647. The next prime is 21032659. The reversal of 21032650 is 5623012.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 13097161 + 7935489 = 3619^2 + 2817^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3835 + ... + 7534.

Almost surely, 2^21032650 is an apocalyptic number.

21032650 is a deficient number, since it is larger than the sum of its proper divisors (19148930).

21032650 is a wasteful number, since it uses less digits than its factorization.

21032650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11418 (or 11413 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21032650 is about 4586.1367184156. The cubic root of 21032650 is about 276.0353259411.

Adding to 21032650 its reverse (5623012), we get a palindrome (26655662).

It can be divided in two parts, 2103 and 2650, that added together give a triangular number (4753 = T₉₇).

The spelling of 21032650 in words is "twenty-one million, thirty-two thousand, six hundred fifty".