25133021 has 4 divisors (see below), whose sum is σ = 26611452. Its totient is φ = 23654592.

The previous prime is 25132967. The next prime is 25133047. The reversal of 25133021 is 12033152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10310521 + 14822500 = 3211^2 + 3850^2 .

It is a cyclic number.

It is not a de Polignac number, because 25133021 - 2⁶ = 25132957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1478413 = 25133021 / (2 + 5 + 1 + 3 + 3 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25133051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 739190 + ... + 739223.

It is an arithmetic number, because the mean of its divisors is an integer number (6652863).

Almost surely, 2^25133021 is an apocalyptic number.

It is an amenable number.

25133021 is a deficient number, since it is larger than the sum of its proper divisors (1478431).

25133021 is a wasteful number, since it uses less digits than its factorization.

25133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478430.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 25133021 is about 5013.2844523326. The cubic root of 25133021 is about 292.9194644059.

Adding to 25133021 its reverse (12033152), we get a palindrome (37166173).

The spelling of 25133021 in words is "twenty-five million, one hundred thirty-three thousand, twenty-one".