21825100 has 36 divisors (see below), whose sum is σ = 51668568. Its totient is φ = 7936000.

The previous prime is 21825071. The next prime is 21825109. The reversal of 21825100 is 152812.

It is not an unprimeable number, because it can be changed into a prime (21825109) 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, 8821 + ... + 11020.

It is an arithmetic number, because the mean of its divisors is an integer number (1435238).

Almost surely, 2^21825100 is an apocalyptic number.

21825100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21825100 is an abundant number, since it is smaller than the sum of its proper divisors (29843468).

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

21825100 is a wasteful number, since it uses less digits than its factorization.

21825100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19866 (or 19859 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 21825100 is about 4671.7341533953. The cubic root of 21825100 is about 279.4594161736.

Adding to 21825100 its reverse (152812), we get a palindrome (21977912).

The spelling of 21825100 in words is "twenty-one million, eight hundred twenty-five thousand, one hundred".