25713421 has 4 divisors (see below), whose sum is σ = 25776700. Its totient is φ = 25650144.

The previous prime is 25713419. The next prime is 25713433. The reversal of 25713421 is 12431752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14356521 + 11356900 = 3789^2 + 3370^2 .

It is a cyclic number.

It is not a de Polignac number, because 25713421 - 2¹ = 25713419 is a prime.

It is a super-2 number, since 2×25713421² = 1322360039046482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25713451) 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 3 ways as a sum of consecutive naturals, for example, 31026 + ... + 31843.

It is an arithmetic number, because the mean of its divisors is an integer number (6444175).

Almost surely, 2^25713421 is an apocalyptic number.

It is an amenable number.

25713421 is a deficient number, since it is larger than the sum of its proper divisors (63279).

25713421 is an equidigital number, since it uses as much as digits as its factorization.

25713421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63278.

The product of its digits is 1680, while the sum is 25.

The square root of 25713421 is about 5070.8402656759. The cubic root of 25713421 is about 295.1571354748.

The spelling of 25713421 in words is "twenty-five million, seven hundred thirteen thousand, four hundred twenty-one".