1232521421 has 2 divisors, whose sum is σ = 1232521422. Its totient is φ = 1232521420.

The previous prime is 1232521417. The next prime is 1232521429. The reversal of 1232521421 is 1241252321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1098193321 + 134328100 = 33139^2 + 11590^2 .

It is an emirp because it is prime and its reverse (1241252321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1232521421 - 2² = 1232521417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232521429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616260710 + 616260711.

It is an arithmetic number, because the mean of its divisors is an integer number (616260711).

Almost surely, 2^1232521421 is an apocalyptic number.

It is an amenable number.

1232521421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232521421 is an equidigital number, since it uses as much as digits as its factorization.

1232521421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 1232521421 is about 35107.2844435453. The cubic root of 1232521421 is about 1072.1728985831.

Adding to 1232521421 its reverse (1241252321), we get a palindrome (2473773742).

The spelling of 1232521421 in words is "one billion, two hundred thirty-two million, five hundred twenty-one thousand, four hundred twenty-one".