1021020111101 has 2 divisors, whose sum is σ = 1021020111102. Its totient is φ = 1021020111100.

The previous prime is 1021020111029. The next prime is 1021020111151. The reversal of 1021020111101 is 1011110201201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 610389063076 + 410631048025 = 781274^2 + 640805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021020111101 - 2¹⁸ = 1021019848957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021020111151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510055550 + 510510055551.

It is an arithmetic number, because the mean of its divisors is an integer number (510510055551).

Almost surely, 2^{1021020111101} is an apocalyptic number.

It is an amenable number.

1021020111101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021020111101 is an equidigital number, since it uses as much as digits as its factorization.

1021020111101 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 11.

Adding to 1021020111101 its reverse (1011110201201), we get a palindrome (2032130312302).

The spelling of 1021020111101 in words is "one trillion, twenty-one billion, twenty million, one hundred eleven thousand, one hundred one".