25221573 has 24 divisors (see below), whose sum is σ = 39784472. Its totient is φ = 15303168.

The previous prime is 25221571. The next prime is 25221583. The reversal of 25221573 is 37512252.

It can be written as a sum of positive squares in 4 ways, for example, as 3849444 + 21372129 = 1962^2 + 4623^2 .

It is not a de Polignac number, because 25221573 - 2¹ = 25221571 is a prime.

It is a super-2 number, since 2×25221573² = 1272255489188658, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7065 + ... + 10017.

Almost surely, 2^25221573 is an apocalyptic number.

It is an amenable number.

25221573 is a deficient number, since it is larger than the sum of its proper divisors (14562899).

25221573 is a wasteful number, since it uses less digits than its factorization.

25221573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045 (or 3042 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 25221573 is about 5022.1084217687. The cubic root of 25221573 is about 293.2630787616.

It can be divided in two parts, 2522 and 1573, that added together give a triangular number (4095 = T₉₀).

The spelling of 25221573 in words is "twenty-five million, two hundred twenty-one thousand, five hundred seventy-three".