21650325 has 24 divisors (see below), whose sum is σ = 36092928. Its totient is φ = 11450880.

The previous prime is 21650297. The next prime is 21650339. The reversal of 21650325 is 52305612.

It is not a de Polignac number, because 21650325 - 2⁶ = 21650261 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21650295 and 21650304.

It is a congruent number.

It is an unprimeable number.

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, 8389 + ... + 10661.

It is an arithmetic number, because the mean of its divisors is an integer number (1503872).

Almost surely, 2^21650325 is an apocalyptic number.

21650325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21650325 is a deficient number, since it is larger than the sum of its proper divisors (14442603).

21650325 is a wasteful number, since it uses less digits than its factorization.

21650325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413 (or 2408 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 21650325 is about 4652.9909735567. The cubic root of 21650325 is about 278.7114474087.

Adding to 21650325 its reverse (52305612), we get a palindrome (73955937).

The spelling of 21650325 in words is "twenty-one million, six hundred fifty thousand, three hundred twenty-five".