21095425 has 18 divisors (see below), whose sum is σ = 28330962. Its totient is φ = 15575040.

The previous prime is 21095423. The next prime is 21095429. The reversal of 21095425 is 52459012.

It can be written as a sum of positive squares in 9 ways, for example, as 14984641 + 6110784 = 3871^2 + 2472^2 .

It is not a de Polignac number, because 21095425 - 2¹ = 21095423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21095393 and 21095402.

It is not an unprimeable number, because it can be changed into a prime (21095423) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1729 + ... + 6721.

Almost surely, 2^21095425 is an apocalyptic number.

21095425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21095425 is a deficient number, since it is larger than the sum of its proper divisors (7235537).

21095425 is a wasteful number, since it uses less digits than its factorization.

21095425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5029 (or 5011 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 21095425 is about 4592.9756150017. The cubic root of 21095425 is about 276.3096756892.

The spelling of 21095425 in words is "twenty-one million, ninety-five thousand, four hundred twenty-five".