10101111110021 has 4 divisors (see below), whose sum is σ = 10118863502700. Its totient is φ = 10083358717344.

The previous prime is 10101111110011. The next prime is 10101111110047. The reversal of 10101111110021 is 12001111110101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4805911833121 + 5295199276900 = 2192239^2 + 2301130^2 .

It is a cyclic number.

It is not a de Polignac number, because 10101111110021 - 2¹⁰ = 10101111108997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10101111109984 and 10101111110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101111110011) 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 in 3 ways as a sum of consecutive naturals, for example, 8876195486 + ... + 8876196623.

It is an arithmetic number, because the mean of its divisors is an integer number (2529715875675).

Almost surely, 2^{10101111110021} is an apocalyptic number.

It is an amenable number.

10101111110021 is a deficient number, since it is larger than the sum of its proper divisors (17752392679).

10101111110021 is an equidigital number, since it uses as much as digits as its factorization.

10101111110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17752392678.

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

Adding to 10101111110021 its reverse (12001111110101), we get a palindrome (22102222220122).

The spelling of 10101111110021 in words is "ten trillion, one hundred one billion, one hundred eleven million, one hundred ten thousand, twenty-one".