431212421 has 4 divisors (see below), whose sum is σ = 431630892. Its totient is φ = 430793952.

The previous prime is 431212367. The next prime is 431212427. The reversal of 431212421 is 124212134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 425968321 + 5244100 = 20639^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 431212421 - 2²⁶ = 364103557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431212393 and 431212402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431212427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207686 + ... + 209751.

It is an arithmetic number, because the mean of its divisors is an integer number (107907723).

Almost surely, 2^431212421 is an apocalyptic number.

It is an amenable number.

431212421 is a deficient number, since it is larger than the sum of its proper divisors (418471).

431212421 is a wasteful number, since it uses less digits than its factorization.

431212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418470.

The product of its digits is 384, while the sum is 20.

The square root of 431212421 is about 20765.6548415888. The cubic root of 431212421 is about 755.4929581846.

Adding to 431212421 its reverse (124212134), we get a palindrome (555424555).

The spelling of 431212421 in words is "four hundred thirty-one million, two hundred twelve thousand, four hundred twenty-one".