25721223 has 16 divisors (see below), whose sum is σ = 37497600. Its totient is φ = 15553280.

The previous prime is 25721203. The next prime is 25721239. The reversal of 25721223 is 32212752.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25721223 - 2⁸ = 25720967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25721193 and 25721202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25721203) 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, 27223 + ... + 28151.

It is an arithmetic number, because the mean of its divisors is an integer number (2343600).

Almost surely, 2^25721223 is an apocalyptic number.

25721223 is a deficient number, since it is larger than the sum of its proper divisors (11776377).

25721223 is a wasteful number, since it uses less digits than its factorization.

25721223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782.

The product of its digits is 1680, while the sum is 24.

The square root of 25721223 is about 5071.6095078387. The cubic root of 25721223 is about 295.1869847781.

Adding to 25721223 its reverse (32212752), we get a palindrome (57933975).

The spelling of 25721223 in words is "twenty-five million, seven hundred twenty-one thousand, two hundred twenty-three".