231403421 has 2 divisors, whose sum is σ = 231403422. Its totient is φ = 231403420.

The previous prime is 231403411. The next prime is 231403429. The reversal of 231403421 is 124304132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231374521 + 28900 = 15211^2 + 170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231403421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231403393 and 231403402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231403429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115701710 + 115701711.

It is an arithmetic number, because the mean of its divisors is an integer number (115701711).

Almost surely, 2^231403421 is an apocalyptic number.

It is an amenable number.

231403421 is a deficient number, since it is larger than the sum of its proper divisors (1).

231403421 is an equidigital number, since it uses as much as digits as its factorization.

231403421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 231403421 is about 15211.9499407538. The cubic root of 231403421 is about 613.9362234684.

Adding to 231403421 its reverse (124304132), we get a palindrome (355707553).

The spelling of 231403421 in words is "two hundred thirty-one million, four hundred three thousand, four hundred twenty-one".