203112421 has 2 divisors, whose sum is σ = 203112422. Its totient is φ = 203112420.

The previous prime is 203112407. The next prime is 203112439. The reversal of 203112421 is 124211302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184579396 + 18533025 = 13586^2 + 4305^2 .

It is a cyclic number.

It is not a de Polignac number, because 203112421 - 2⁵ = 203112389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203112395 and 203112404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203110421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101556210 + 101556211.

It is an arithmetic number, because the mean of its divisors is an integer number (101556211).

Almost surely, 2^203112421 is an apocalyptic number.

It is an amenable number.

203112421 is a deficient number, since it is larger than the sum of its proper divisors (1).

203112421 is an equidigital number, since it uses as much as digits as its factorization.

203112421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 203112421 is about 14251.7515063939. The cubic root of 203112421 is about 587.8215373457.

Adding to 203112421 its reverse (124211302), we get a palindrome (327323723).

The spelling of 203112421 in words is "two hundred three million, one hundred twelve thousand, four hundred twenty-one".