1011110021 has 2 divisors, whose sum is σ = 1011110022. Its totient is φ = 1011110020.

The previous prime is 1011110011. The next prime is 1011110029. The reversal of 1011110021 is 1200111101.

It is a happy number.

It is an a-pointer prime, because the next prime (1011110029) can be obtained adding 1011110021 to its sum of digits (8).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1005587521 + 5522500 = 31711^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011110021 - 2¹⁴ = 1011093637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1011109990 and 1011110008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011110029) 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, 505555010 + 505555011.

It is an arithmetic number, because the mean of its divisors is an integer number (505555011).

Almost surely, 2^1011110021 is an apocalyptic number.

It is an amenable number.

1011110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011110021 is an equidigital number, since it uses as much as digits as its factorization.

1011110021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 1011110021 is about 31797.9562393560. The cubic root of 1011110021 is about 1003.6897096323.

Adding to 1011110021 its reverse (1200111101), we get a palindrome (2211221122).

The spelling of 1011110021 in words is "one billion, eleven million, one hundred ten thousand, twenty-one".