10010101000021 has 2 divisors, whose sum is σ = 10010101000022. Its totient is φ = 10010101000020.

The previous prime is 10010100999971. The next prime is 10010101000033. The reversal of 10010101000021 is 12000010101001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9842111681796 + 167989318225 = 3137214^2 + 409865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10010101000021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10010100999968 and 10010101000013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10010101090021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005050500010 + 5005050500011.

It is an arithmetic number, because the mean of its divisors is an integer number (5005050500011).

Almost surely, 2^{10010101000021} is an apocalyptic number.

It is an amenable number.

10010101000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10010101000021 is an equidigital number, since it uses as much as digits as its factorization.

10010101000021 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 7.

Adding to 10010101000021 its reverse (12000010101001), we get a palindrome (22010111101022).

The spelling of 10010101000021 in words is "ten trillion, ten billion, one hundred one million, twenty-one", and thus it is an aban number.