1011110020021 has 2 divisors, whose sum is σ = 1011110020022. Its totient is φ = 1011110020020.

The previous prime is 1011110020013. The next prime is 1011110020031. The reversal of 1011110020021 is 1200200111101.

It is an a-pointer prime, because the next prime (1011110020031) can be obtained adding 1011110020021 to its sum of digits (10).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 878926875121 + 132183144900 = 937511^2 + 363570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011110020021 - 2³ = 1011110020013 is a prime.

It is a super-4 number, since 4×1011110020021⁴ (a number of 49 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011110020031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505555010010 + 505555010011.

It is an arithmetic number, because the mean of its divisors is an integer number (505555010011).

Almost surely, 2^{1011110020021} is an apocalyptic number.

It is an amenable number.

1011110020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011110020021 is an equidigital number, since it uses as much as digits as its factorization.

1011110020021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1011110020021 its reverse (1200200111101), we get a palindrome (2211310131122).

The spelling of 1011110020021 in words is "one trillion, eleven billion, one hundred ten million, twenty thousand, twenty-one".