21850425 has 24 divisors (see below), whose sum is σ = 40141280. Its totient is φ = 11653200.

The previous prime is 21850393. The next prime is 21850429. The reversal of 21850425 is 52405812.

It is a happy number.

It is not a de Polignac number, because 21850425 - 2⁵ = 21850393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21850429) 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 23 ways as a sum of consecutive naturals, for example, 15511 + ... + 16860.

Almost surely, 2^21850425 is an apocalyptic number.

21850425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21850425 is a deficient number, since it is larger than the sum of its proper divisors (18290855).

21850425 is a wasteful number, since it uses less digits than its factorization.

21850425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32390 (or 32379 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 21850425 is about 4674.4438171830. The cubic root of 21850425 is about 279.5674656834.

The spelling of 21850425 in words is "twenty-one million, eight hundred fifty thousand, four hundred twenty-five".