21634125 has 32 divisors (see below), whose sum is σ = 37180416. Its totient is φ = 11160000.

The previous prime is 21634121. The next prime is 21634127. The reversal of 21634125 is 52143612.

It is not a de Polignac number, because 21634125 - 2² = 21634121 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 = 21634095 and 21634104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634121) 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 31 ways as a sum of consecutive naturals, for example, 10695 + ... + 12555.

It is an arithmetic number, because the mean of its divisors is an integer number (1161888).

Almost surely, 2^21634125 is an apocalyptic number.

21634125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21634125 is a deficient number, since it is larger than the sum of its proper divisors (15546291).

21634125 is a wasteful number, since it uses less digits than its factorization.

21634125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910 (or 1900 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 21634125 is about 4651.2498320344. The cubic root of 21634125 is about 278.6419141635.

Adding to 21634125 its reverse (52143612), we get a palindrome (73777737).

The spelling of 21634125 in words is "twenty-one million, six hundred thirty-four thousand, one hundred twenty-five".