10101011111021 has 2 divisors, whose sum is σ = 10101011111022. Its totient is φ = 10101011111020.

The previous prime is 10101011110999. The next prime is 10101011111033. The reversal of 10101011111021 is 12011111010101.

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., 10031979328900 + 69031782121 = 3167330^2 + 262739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10101011111021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10101011110993 and 10101011111011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10101011111221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050505555510 + 5050505555511.

It is an arithmetic number, because the mean of its divisors is an integer number (5050505555511).

Almost surely, 2^{10101011111021} is an apocalyptic number.

It is an amenable number.

10101011111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10101011111021 is an equidigital number, since it uses as much as digits as its factorization.

10101011111021 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 10101011111021 its reverse (12011111010101), we get a palindrome (22112122121122).

The spelling of 10101011111021 in words is "ten trillion, one hundred one billion, eleven million, one hundred eleven thousand, twenty-one".