1020110110021 has 2 divisors, whose sum is σ = 1020110110022. Its totient is φ = 1020110110020.

The previous prime is 1020110110007. The next prime is 1020110110049. The reversal of 1020110110021 is 1200110110201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 892061360100 + 128048749921 = 944490^2 + 357839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020110110021 - 2²⁹ = 1019573239109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020110110121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510055055010 + 510055055011.

It is an arithmetic number, because the mean of its divisors is an integer number (510055055011).

Almost surely, 2^{1020110110021} is an apocalyptic number.

It is an amenable number.

1020110110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020110110021 is an equidigital number, since it uses as much as digits as its factorization.

1020110110021 is an evil number, because the sum of its binary digits is even.

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

Adding to 1020110110021 its reverse (1200110110201), we get a palindrome (2220220220222).

The spelling of 1020110110021 in words is "one trillion, twenty billion, one hundred ten million, one hundred ten thousand, twenty-one".