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25021 = 131191

25021 has 4 divisors (see below), whose sum is σ = 25344. Its totient is φ = 24700.

The previous prime is 25013. The next prime is 25031. The reversal of 25021 is 12052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25021 - 23 = 25013 is a prime.

It is a Duffinian number.

25021 is a lucky number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 24989 and 25007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25031) 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, 36 + ... + 226.

It is an arithmetic number, because the mean of its divisors is an integer number (6336).

225021 is an apocalyptic number.

It is an amenable number.

25021 is a deficient number, since it is larger than the sum of its proper divisors (323).

25021 is a wasteful number, since it uses less digits than its factorization.

25021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 25021 is about 158.1802768995. The cubic root of 25021 is about 29.2483623404.

Adding to 25021 its reverse (12052), we get a palindrome (37073).

The spelling of 25021 in words is "twenty-five thousand, twenty-one".

Divisors: 1 131 191 25021