21625134 has 8 divisors (see below), whose sum is σ = 43250280. Its totient is φ = 7208376.

The previous prime is 21625117. The next prime is 21625181. The reversal of 21625134 is 43152612.

It is a sphenic number, since it is the product of 3 distinct primes.

21625134 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1802089 + ... + 1802100.

It is an arithmetic number, because the mean of its divisors is an integer number (5406285).

Almost surely, 2^21625134 is an apocalyptic number.

21625134 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21625134 is a wasteful number, since it uses less digits than its factorization.

21625134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604194.

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

The square root of 21625134 is about 4650.2832171815. The cubic root of 21625134 is about 278.6033082328.

Adding to 21625134 its reverse (43152612), we get a palindrome (64777746).

The spelling of 21625134 in words is "twenty-one million, six hundred twenty-five thousand, one hundred thirty-four".