20101012000021 has 2 divisors, whose sum is σ = 20101012000022. Its totient is φ = 20101012000020.

The previous prime is 20101011999997. The next prime is 20101012000031. The reversal of 20101012000021 is 12000021010102.

It is an a-pointer prime, because the next prime (20101012000031) can be obtained adding 20101012000021 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20100965228100 + 46771921 = 4483410^2 + 6839^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101012000021 - 2⁵ = 20101011999989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20101011999971 and 20101012000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101012000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050506000010 + 10050506000011.

It is an arithmetic number, because the mean of its divisors is an integer number (10050506000011).

Almost surely, 2^{20101012000021} is an apocalyptic number.

It is an amenable number.

20101012000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101012000021 is an equidigital number, since it uses as much as digits as its factorization.

20101012000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20101012000021 its reverse (12000021010102), we get a palindrome (32101033010123).

The spelling of 20101012000021 in words is "twenty trillion, one hundred one billion, twelve million, twenty-one", and thus it is an aban number.