231021425 has 6 divisors (see below), whose sum is σ = 286466598. Its totient is φ = 184817120.

The previous prime is 231021419. The next prime is 231021431. The reversal of 231021425 is 524120132.

It is an interprime number because it is at equal distance from previous prime (231021419) and next prime (231021431).

It can be written as a sum of positive squares in 3 ways, for example, as 20394256 + 210627169 = 4516^2 + 14513^2 .

It is not a de Polignac number, because 231021425 - 2⁴ = 231021409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231021397 and 231021406.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4620404 + ... + 4620453.

It is an arithmetic number, because the mean of its divisors is an integer number (47744433).

Almost surely, 2^231021425 is an apocalyptic number.

231021425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231021425 is a deficient number, since it is larger than the sum of its proper divisors (55445173).

231021425 is an equidigital number, since it uses as much as digits as its factorization.

231021425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9240867 (or 9240862 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 231021425 is about 15199.3889679816. The cubic root of 231021425 is about 613.5982129834.

Adding to 231021425 its reverse (524120132), we get a palindrome (755141557).

The spelling of 231021425 in words is "two hundred thirty-one million, twenty-one thousand, four hundred twenty-five".