1204231421 has 2 divisors, whose sum is σ = 1204231422. Its totient is φ = 1204231420.

The previous prime is 1204231417. The next prime is 1204231423. The reversal of 1204231421 is 1241324021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1181296900 + 22934521 = 34370^2 + 4789^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204231421 - 2² = 1204231417 is a prime.

It is a Sophie Germain prime.

Together with 1204231423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1204231393 and 1204231402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1204231423) 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, 602115710 + 602115711.

It is an arithmetic number, because the mean of its divisors is an integer number (602115711).

Almost surely, 2^1204231421 is an apocalyptic number.

It is an amenable number.

1204231421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204231421 is an equidigital number, since it uses as much as digits as its factorization.

1204231421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1204231421 is about 34702.0377067399. The cubic root of 1204231421 is about 1063.9061472068.

Adding to 1204231421 its reverse (1241324021), we get a palindrome (2445555442).

The spelling of 1204231421 in words is "one billion, two hundred four million, two hundred thirty-one thousand, four hundred twenty-one".