25025721 has 12 divisors (see below), whose sum is σ = 38815632. Its totient is φ = 14300328.

The previous prime is 25025687. The next prime is 25025783. The reversal of 25025721 is 12752052.

It is not a de Polignac number, because 25025721 - 2¹¹ = 25023673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25025691 and 25025700.

It is not an unprimeable number, because it can be changed into a prime (25021721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84975 + ... + 85268.

It is an arithmetic number, because the mean of its divisors is an integer number (3234636).

Almost surely, 2^25025721 is an apocalyptic number.

25025721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25025721 is a deficient number, since it is larger than the sum of its proper divisors (13789911).

25025721 is a wasteful number, since it uses less digits than its factorization.

25025721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170260 (or 170253 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 25025721 is about 5002.5714387703. The cubic root of 25025721 is about 292.5020176645.

Adding to 25025721 its reverse (12752052), we get a palindrome (37777773).

It can be divided in two parts, 250257 and 21, that added together give a triangular number (250278 = T₇₀₇).

The spelling of 25025721 in words is "twenty-five million, twenty-five thousand, seven hundred twenty-one".