1431213221 has 4 divisors (see below), whose sum is σ = 1515402252. Its totient is φ = 1347024192.

The previous prime is 1431213193. The next prime is 1431213263. The reversal of 1431213221 is 1223121341.

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 811452196 + 619761025 = 28486^2 + 24895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431213221 - 2¹⁰ = 1431212197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1431213193 and 1431213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431213821) 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, 42094490 + ... + 42094523.

It is an arithmetic number, because the mean of its divisors is an integer number (378850563).

Almost surely, 2^1431213221 is an apocalyptic number.

It is an amenable number.

1431213221 is a deficient number, since it is larger than the sum of its proper divisors (84189031).

1431213221 is an equidigital number, since it uses as much as digits as its factorization.

1431213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84189030.

The product of its digits is 288, while the sum is 20.

The square root of 1431213221 is about 37831.3787879850. The cubic root of 1431213221 is about 1126.9416926694.

Adding to 1431213221 its reverse (1223121341), we get a palindrome (2654334562).

The spelling of 1431213221 in words is "one billion, four hundred thirty-one million, two hundred thirteen thousand, two hundred twenty-one".