1213221077 has 2 divisors, whose sum is σ = 1213221078. Its totient is φ = 1213221076.

The previous prime is 1213221067. The next prime is 1213221137. The reversal of 1213221077 is 7701223121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1191561361 + 21659716 = 34519^2 + 4654^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213221077 - 2⁶ = 1213221013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213221007) 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, 606610538 + 606610539.

It is an arithmetic number, because the mean of its divisors is an integer number (606610539).

Almost surely, 2^1213221077 is an apocalyptic number.

It is an amenable number.

1213221077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213221077 is an equidigital number, since it uses as much as digits as its factorization.

1213221077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 1213221077 is about 34831.3232163236. The cubic root of 1213221077 is about 1066.5469600799.

Adding to 1213221077 its reverse (7701223121), we get a palindrome (8914444198).

The spelling of 1213221077 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, seventy-seven".