25421105 has 4 divisors (see below), whose sum is σ = 30505332. Its totient is φ = 20336880.

The previous prime is 25421093. The next prime is 25421111. The reversal of 25421105 is 50112452.

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 9991921 + 15429184 = 3161^2 + 3928^2 .

It is not a de Polignac number, because 25421105 - 2¹⁸ = 25158961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2542106 + ... + 2542115.

It is an arithmetic number, because the mean of its divisors is an integer number (7626333).

Almost surely, 2^25421105 is an apocalyptic number.

It is an amenable number.

25421105 is a deficient number, since it is larger than the sum of its proper divisors (5084227).

25421105 is an equidigital number, since it uses as much as digits as its factorization.

25421105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5084226.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 25421105 is about 5041.9346485253. The cubic root of 25421105 is about 294.0343990787.

Adding to 25421105 its reverse (50112452), we get a palindrome (75533557).

It can be divided in two parts, 25421 and 105, that multiplied together give a triangular number (2669205 = T₂₃₁₀).

The spelling of 25421105 in words is "twenty-five million, four hundred twenty-one thousand, one hundred five".