1010111111021 has 2 divisors, whose sum is σ = 1010111111022. Its totient is φ = 1010111111020.

The previous prime is 1010111110979. The next prime is 1010111111029. The reversal of 1010111111021 is 1201111110101.

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., 820310604100 + 189800506921 = 905710^2 + 435661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1010111111021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1010111110993 and 1010111111011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010111111029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505055555510 + 505055555511.

It is an arithmetic number, because the mean of its divisors is an integer number (505055555511).

Almost surely, 2^{1010111111021} is an apocalyptic number.

It is an amenable number.

1010111111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010111111021 is an equidigital number, since it uses as much as digits as its factorization.

1010111111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 1010111111021 its reverse (1201111110101), we get a palindrome (2211222221122).

The spelling of 1010111111021 in words is "one trillion, ten billion, one hundred eleven million, one hundred eleven thousand, twenty-one".