1011221069 has 2 divisors, whose sum is σ = 1011221070. Its totient is φ = 1011221068.

The previous prime is 1011221051. The next prime is 1011221077. The reversal of 1011221069 is 9601221101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 545222500 + 465998569 = 23350^2 + 21587^2 .

It is an emirp because it is prime and its reverse (9601221101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011221069 is a prime.

It is a super-2 number, since 2×1011221069² = 2045136100779005522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011220069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505610534 + 505610535.

It is an arithmetic number, because the mean of its divisors is an integer number (505610535).

Almost surely, 2^1011221069 is an apocalyptic number.

It is an amenable number.

1011221069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011221069 is an equidigital number, since it uses as much as digits as its factorization.

1011221069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1011221069 is about 31799.7023413742. The cubic root of 1011221069 is about 1003.7264526350.

The spelling of 1011221069 in words is "one billion, eleven million, two hundred twenty-one thousand, sixty-nine".