21250750 has 32 divisors (see below), whose sum is σ = 40098240. Its totient is φ = 8432800.

The previous prime is 21250709. The next prime is 21250771. The reversal of 21250750 is 5705212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41496 + ... + 42004.

It is an arithmetic number, because the mean of its divisors is an integer number (1253070).

Almost surely, 2^21250750 is an apocalyptic number.

21250750 is a deficient number, since it is larger than the sum of its proper divisors (18847490).

21250750 is a wasteful number, since it uses less digits than its factorization.

21250750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 21250750 is about 4609.8535768504. The cubic root of 21250750 is about 276.9861714219.

Adding to 21250750 its reverse (5705212), we get a palindrome (26955962).

The spelling of 21250750 in words is "twenty-one million, two hundred fifty thousand, seven hundred fifty".