21625104 has 40 divisors (see below), whose sum is σ = 57670912. Its totient is φ = 6975360.

The previous prime is 21625103. The next prime is 21625111. The reversal of 21625104 is 40152612.

It is not an unprimeable number, because it can be changed into a prime (21625103) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5779 + ... + 8754.

Almost surely, 2^21625104 is an apocalyptic number.

21625104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21625104 is an abundant number, since it is smaller than the sum of its proper divisors (36045808).

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

21625104 is a wasteful number, since it uses less digits than its factorization.

21625104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14575 (or 14569 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21625104 is about 4650.2799915704. The cubic root of 21625104 is about 278.6031793997.

Adding to 21625104 its reverse (40152612), we get a palindrome (61777716).

The spelling of 21625104 in words is "twenty-one million, six hundred twenty-five thousand, one hundred four".