1011221129 has 2 divisors, whose sum is σ = 1011221130. Its totient is φ = 1011221128.

The previous prime is 1011221111. The next prime is 1011221161. The reversal of 1011221129 is 9211221101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 721029904 + 290191225 = 26852^2 + 17035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011221129 - 2²⁴ = 994443913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011221129.

It is not a weakly prime, because it can be changed into another prime (1011226129) 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, 505610564 + 505610565.

It is an arithmetic number, because the mean of its divisors is an integer number (505610565).

Almost surely, 2^1011221129 is an apocalyptic number.

It is an amenable number.

1011221129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011221129 is an equidigital number, since it uses as much as digits as its factorization.

1011221129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1011221129 is about 31799.7032847792. The cubic root of 1011221129 is about 1003.7264724868.

The spelling of 1011221129 in words is "one billion, eleven million, two hundred twenty-one thousand, one hundred twenty-nine".