433121232421 has 2 divisors, whose sum is σ = 433121232422. Its totient is φ = 433121232420.

The previous prime is 433121232409. The next prime is 433121232431. The reversal of 433121232421 is 124232121334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331443155521 + 101678076900 = 575711^2 + 318870^2 .

It is a cyclic number.

It is not a de Polignac number, because 433121232421 - 2¹⁹ = 433120708133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 433121232421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (433121232431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216560616210 + 216560616211.

It is an arithmetic number, because the mean of its divisors is an integer number (216560616211).

Almost surely, 2^433121232421 is an apocalyptic number.

It is an amenable number.

433121232421 is a deficient number, since it is larger than the sum of its proper divisors (1).

433121232421 is an equidigital number, since it uses as much as digits as its factorization.

433121232421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 28.

Adding to 433121232421 its reverse (124232121334), we get a palindrome (557353353755).

The spelling of 433121232421 in words is "four hundred thirty-three billion, one hundred twenty-one million, two hundred thirty-two thousand, four hundred twenty-one".