20101211010101 has 4 divisors (see below), whose sum is σ = 21647458010892. Its totient is φ = 18554964009312.

The previous prime is 20101211010091. The next prime is 20101211010143. The reversal of 20101211010101 is 10101011210102.

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 1483073374225 + 18618137635876 = 1217815^2 + 4314874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20101211010101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101211019101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773123500376 + ... + 773123500401.

It is an arithmetic number, because the mean of its divisors is an integer number (5411864502723).

Almost surely, 2^{20101211010101} is an apocalyptic number.

It is an amenable number.

20101211010101 is a deficient number, since it is larger than the sum of its proper divisors (1546247000791).

20101211010101 is a wasteful number, since it uses less digits than its factorization.

20101211010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546247000790.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20101211010101 its reverse (10101011210102), we get a palindrome (30202222220203).

The spelling of 20101211010101 in words is "twenty trillion, one hundred one billion, two hundred eleven million, ten thousand, one hundred one".