1221013229 has 2 divisors, whose sum is σ = 1221013230. Its totient is φ = 1221013228.

The previous prime is 1221013217. The next prime is 1221013243. The reversal of 1221013229 is 9223101221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1183497604 + 37515625 = 34402^2 + 6125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221013229 - 2⁸ = 1221012973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221013529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610506614 + 610506615.

It is an arithmetic number, because the mean of its divisors is an integer number (610506615).

Almost surely, 2^1221013229 is an apocalyptic number.

It is an amenable number.

1221013229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221013229 is an equidigital number, since it uses as much as digits as its factorization.

1221013229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1221013229 is about 34942.9997138196. Note that the first 3 decimals coincide. The cubic root of 1221013229 is about 1068.8254584890.

The spelling of 1221013229 in words is "one billion, two hundred twenty-one million, thirteen thousand, two hundred twenty-nine".