21674125 has 24 divisors (see below), whose sum is σ = 29752632. Its totient is φ = 15752000.

The previous prime is 21674123. The next prime is 21674129. The reversal of 21674125 is 52147612.

It can be written as a sum of positive squares in 4 ways, for example, as 23716 + 21650409 = 154^2 + 4653^2 .

It is not a de Polignac number, because 21674125 - 2¹ = 21674123 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21674093 and 21674102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14409 + ... + 15841.

It is an arithmetic number, because the mean of its divisors is an integer number (1239693).

Almost surely, 2^21674125 is an apocalyptic number.

21674125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21674125 is a deficient number, since it is larger than the sum of its proper divisors (8078507).

21674125 is a wasteful number, since it uses less digits than its factorization.

21674125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470 (or 1449 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 21674125 is about 4655.5477658381. The cubic root of 21674125 is about 278.8135383054.

The spelling of 21674125 in words is "twenty-one million, six hundred seventy-four thousand, one hundred twenty-five".