431224421 has 2 divisors, whose sum is σ = 431224422. Its totient is φ = 431224420.

The previous prime is 431224411. The next prime is 431224427. The reversal of 431224421 is 124422134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290327521 + 140896900 = 17039^2 + 11870^2 .

It is a cyclic number.

It is not a de Polignac number, because 431224421 - 2⁶ = 431224357 is a prime.

It is a super-3 number, since 3×431224421³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431224427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215612210 + 215612211.

It is an arithmetic number, because the mean of its divisors is an integer number (215612211).

Almost surely, 2^431224421 is an apocalyptic number.

It is an amenable number.

431224421 is a deficient number, since it is larger than the sum of its proper divisors (1).

431224421 is an equidigital number, since it uses as much as digits as its factorization.

431224421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 23.

The square root of 431224421 is about 20765.9437782153. The cubic root of 431224421 is about 755.4999662012.

Adding to 431224421 its reverse (124422134), we get a palindrome (555646555).

The spelling of 431224421 in words is "four hundred thirty-one million, two hundred twenty-four thousand, four hundred twenty-one".