1221314431 has 2 divisors, whose sum is σ = 1221314432. Its totient is φ = 1221314430.

The previous prime is 1221314429. The next prime is 1221314447. The reversal of 1221314431 is 1344131221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1344131221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221314431 - 2¹ = 1221314429 is a prime.

It is a super-2 number, since 2×1221314431² = 2983217878737707522, which contains 22 as substring.

Together with 1221314429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221314401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610657215 + 610657216.

It is an arithmetic number, because the mean of its divisors is an integer number (610657216).

Almost surely, 2^1221314431 is an apocalyptic number.

1221314431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221314431 is an equidigital number, since it uses as much as digits as its factorization.

1221314431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 1221314431 is about 34947.3093527957. The cubic root of 1221314431 is about 1068.9133379348.

Adding to 1221314431 its reverse (1344131221), we get a palindrome (2565445652).

The spelling of 1221314431 in words is "one billion, two hundred twenty-one million, three hundred fourteen thousand, four hundred thirty-one".