203125421 has 4 divisors (see below), whose sum is σ = 207849312. Its totient is φ = 198401532.

The previous prime is 203125411. The next prime is 203125459. The reversal of 203125421 is 124521302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203125421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203125393 and 203125402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203125411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2361881 + ... + 2361966.

It is an arithmetic number, because the mean of its divisors is an integer number (51962328).

Almost surely, 2^203125421 is an apocalyptic number.

It is an amenable number.

203125421 is a deficient number, since it is larger than the sum of its proper divisors (4723891).

203125421 is an equidigital number, since it uses as much as digits as its factorization.

203125421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4723890.

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

The square root of 203125421 is about 14252.2075833886. The cubic root of 203125421 is about 587.8340780476.

Adding to 203125421 its reverse (124521302), we get a palindrome (327646723).

The spelling of 203125421 in words is "two hundred three million, one hundred twenty-five thousand, four hundred twenty-one".