105421025 has 18 divisors (see below), whose sum is σ = 137976102. Its totient is φ = 79891200.

The previous prime is 105421009. The next prime is 105421027. The reversal of 105421025 is 520124501.

It can be written as a sum of positive squares in 3 ways, for example, as 6677056 + 98743969 = 2584^2 + 9937^2 .

It is not a de Polignac number, because 105421025 - 2⁴ = 105421009 is a prime.

It is a super-2 number, since 2×105421025² = 22227185024101250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105420988 and 105421006.

It is not an unprimeable number, because it can be changed into a prime (105421027) 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 17 ways as a sum of consecutive naturals, for example, 3185 + ... + 14865.

It is an arithmetic number, because the mean of its divisors is an integer number (7665339).

Almost surely, 2^105421025 is an apocalyptic number.

It is an amenable number.

105421025 is a deficient number, since it is larger than the sum of its proper divisors (32555077).

105421025 is a wasteful number, since it uses less digits than its factorization.

105421025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11729 (or 11705 counting only the distinct ones).

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

The square root of 105421025 is about 10267.4741295023. The cubic root of 105421025 is about 472.3991180910.

Adding to 105421025 its reverse (520124501), we get a palindrome (625545526).

The spelling of 105421025 in words is "one hundred five million, four hundred twenty-one thousand, twenty-five".