1221331219 has 2 divisors, whose sum is σ = 1221331220. Its totient is φ = 1221331218.

The previous prime is 1221331117. The next prime is 1221331271. The reversal of 1221331219 is 9121331221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221331219 is a prime.

It is a super-2 number, since 2×1221331219² = 2983299893008051922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221331193 and 1221331202.

It is not a weakly prime, because it can be changed into another prime (1221331019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610665609 + 610665610.

It is an arithmetic number, because the mean of its divisors is an integer number (610665610).

Almost surely, 2^1221331219 is an apocalyptic number.

1221331219 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221331219 is an equidigital number, since it uses as much as digits as its factorization.

1221331219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 1221331219 is about 34947.5495421353. The cubic root of 1221331219 is about 1068.9182356184.

The spelling of 1221331219 in words is "one billion, two hundred twenty-one million, three hundred thirty-one thousand, two hundred nineteen".