21250632 has 32 divisors (see below), whose sum is σ = 57214080. Its totient is φ = 6538560.

The previous prime is 21250589. The next prime is 21250637. The reversal of 21250632 is 23605212.

It is a junction number, because it is equal to n+sod(n) for n = 21250599 and 21250608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33744 + ... + 34367.

It is an arithmetic number, because the mean of its divisors is an integer number (1787940).

Almost surely, 2^21250632 is an apocalyptic number.

It is an amenable number.

21250632 is an abundant number, since it is smaller than the sum of its proper divisors (35963448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21250632 is a wasteful number, since it uses less digits than its factorization.

21250632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68133 (or 68129 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21250632 is about 4609.8407781614. The cubic root of 21250632 is about 276.9856587431.

Adding to 21250632 its reverse (23605212), we get a palindrome (44855844).

The spelling of 21250632 in words is "twenty-one million, two hundred fifty thousand, six hundred thirty-two".