1221221000029 has 2 divisors, whose sum is σ = 1221221000030. Its totient is φ = 1221221000028.

The previous prime is 1221221000011. The next prime is 1221221000047. The reversal of 1221221000029 is 9200001221221.

It is a balanced prime because it is at equal distance from previous prime (1221221000011) and next prime (1221221000047).

It can be written as a sum of positive squares in only one way, i.e., 1217266476804 + 3954523225 = 1103298^2 + 62885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221221000029 - 2³⁹ = 671465186141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221220999973 and 1221221000009.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221221090029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610500014 + 610610500015.

It is an arithmetic number, because the mean of its divisors is an integer number (610610500015).

Almost surely, 2^{1221221000029} is an apocalyptic number.

It is an amenable number.

1221221000029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221221000029 is an equidigital number, since it uses as much as digits as its factorization.

1221221000029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 1221221000029 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-nine", and thus it is an aban number.