1232451421 has 2 divisors, whose sum is σ = 1232451422. Its totient is φ = 1232451420.

The previous prime is 1232451419. The next prime is 1232451433. The reversal of 1232451421 is 1241542321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648262521 + 584188900 = 25461^2 + 24170^2 .

It is an emirp because it is prime and its reverse (1241542321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1232451421 - 2¹ = 1232451419 is a prime.

Together with 1232451419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232451461) 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, 616225710 + 616225711.

It is an arithmetic number, because the mean of its divisors is an integer number (616225711).

Almost surely, 2^1232451421 is an apocalyptic number.

It is an amenable number.

1232451421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232451421 is an equidigital number, since it uses as much as digits as its factorization.

1232451421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 25.

The square root of 1232451421 is about 35106.2874852924. The cubic root of 1232451421 is about 1072.1526004846.

Adding to 1232451421 its reverse (1241542321), we get a palindrome (2473993742).

The spelling of 1232451421 in words is "one billion, two hundred thirty-two million, four hundred fifty-one thousand, four hundred twenty-one".