1431222421 has 2 divisors, whose sum is σ = 1431222422. Its totient is φ = 1431222420.

The previous prime is 1431222391. The next prime is 1431222433. The reversal of 1431222421 is 1242221341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1094683396 + 336539025 = 33086^2 + 18345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1431222421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1431222392 and 1431222401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431222461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715611210 + 715611211.

It is an arithmetic number, because the mean of its divisors is an integer number (715611211).

Almost surely, 2^1431222421 is an apocalyptic number.

It is an amenable number.

1431222421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431222421 is an equidigital number, since it uses as much as digits as its factorization.

1431222421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 22.

The square root of 1431222421 is about 37831.5003799744. The cubic root of 1431222421 is about 1126.9441073670.

Adding to 1431222421 its reverse (1242221341), we get a palindrome (2673443762).

The spelling of 1431222421 in words is "one billion, four hundred thirty-one million, two hundred twenty-two thousand, four hundred twenty-one".