21254625 has 48 divisors (see below), whose sum is σ = 43804800. Its totient is φ = 9712800.

The previous prime is 21254621. The next prime is 21254627. The reversal of 21254625 is 52645212.

It is not a de Polignac number, because 21254625 - 2² = 21254621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21254621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6526 + ... + 9224.

It is an arithmetic number, because the mean of its divisors is an integer number (912600).

Almost surely, 2^21254625 is an apocalyptic number.

21254625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21254625 is an abundant number, since it is smaller than the sum of its proper divisors (22550175).

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

21254625 is a wasteful number, since it uses less digits than its factorization.

21254625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727 (or 2714 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 21254625 is about 4610.2738530374. The cubic root of 21254625 is about 277.0030062188.

Adding to 21254625 its reverse (52645212), we get a palindrome (73899837).

The spelling of 21254625 in words is "twenty-one million, two hundred fifty-four thousand, six hundred twenty-five".