210042425 has 12 divisors (see below), whose sum is σ = 260921916. Its totient is φ = 167731200.

The previous prime is 210042421. The next prime is 210042433. The reversal of 210042425 is 524240012.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 37356544 + 172685881 = 6112^2 + 13141^2 .

It is not a de Polignac number, because 210042425 - 2² = 210042421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210042397 and 210042406.

It is not an unprimeable number, because it can be changed into a prime (210042421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7145 + ... + 21705.

It is an arithmetic number, because the mean of its divisors is an integer number (21743493).

Almost surely, 2^210042425 is an apocalyptic number.

210042425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

210042425 is a deficient number, since it is larger than the sum of its proper divisors (50879491).

210042425 is a wasteful number, since it uses less digits than its factorization.

210042425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15148 (or 15143 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 210042425 is about 14492.8404738340. The cubic root of 210042425 is about 594.4322197064.

Adding to 210042425 its reverse (524240012), we get a palindrome (734282437).

The spelling of 210042425 in words is "two hundred ten million, forty-two thousand, four hundred twenty-five".