13421233421 has 2 divisors, whose sum is σ = 13421233422. Its totient is φ = 13421233420.

The previous prime is 13421233417. The next prime is 13421233429. The reversal of 13421233421 is 12433212431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10842015625 + 2579217796 = 104125^2 + 50786^2 .

It is a cyclic number.

It is not a de Polignac number, because 13421233421 - 2² = 13421233417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13421233429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6710616710 + 6710616711.

It is an arithmetic number, because the mean of its divisors is an integer number (6710616711).

Almost surely, 2^13421233421 is an apocalyptic number.

It is an amenable number.

13421233421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13421233421 is an equidigital number, since it uses as much as digits as its factorization.

13421233421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

Adding to 13421233421 its reverse (12433212431), we get a palindrome (25854445852).

The spelling of 13421233421 in words is "thirteen billion, four hundred twenty-one million, two hundred thirty-three thousand, four hundred twenty-one".