25132821 has 16 divisors (see below), whose sum is σ = 39619200. Its totient is φ = 13866048.

The previous prime is 25132777. The next prime is 25132841. The reversal of 25132821 is 12823152.

It is not a de Polignac number, because 25132821 - 2⁷ = 25132693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25132791 and 25132800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25132841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20026 + ... + 21243.

It is an arithmetic number, because the mean of its divisors is an integer number (2476200).

Almost surely, 2^25132821 is an apocalyptic number.

25132821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25132821 is a deficient number, since it is larger than the sum of its proper divisors (14486379).

25132821 is a wasteful number, since it uses less digits than its factorization.

25132821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41308.

The product of its digits is 960, while the sum is 24.

The square root of 25132821 is about 5013.2645052899. The cubic root of 25132821 is about 292.9186874195.

Adding to 25132821 its reverse (12823152), we get a palindrome (37955973).

The spelling of 25132821 in words is "twenty-five million, one hundred thirty-two thousand, eight hundred twenty-one".