1221066229 has 2 divisors, whose sum is σ = 1221066230. Its totient is φ = 1221066228.

The previous prime is 1221066169. The next prime is 1221066239. The reversal of 1221066229 is 9226601221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728892004 + 492174225 = 26998^2 + 22185^2 .

It is an emirp because it is prime and its reverse (9226601221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221066229 - 2⁷ = 1221066101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221066229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221066239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610533114 + 610533115.

It is an arithmetic number, because the mean of its divisors is an integer number (610533115).

Almost surely, 2^1221066229 is an apocalyptic number.

It is an amenable number.

1221066229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221066229 is an equidigital number, since it uses as much as digits as its factorization.

1221066229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1221066229 is about 34943.7580835262. The cubic root of 1221066229 is about 1068.8409229487.

The spelling of 1221066229 in words is "one billion, two hundred twenty-one million, sixty-six thousand, two hundred twenty-nine".