20011010101 has 4 divisors (see below), whose sum is σ = 20012771212. Its totient is φ = 20009248992.

The previous prime is 20011010087. The next prime is 20011010161. The reversal of 20011010101 is 10101011002.

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 12747539025 + 7263471076 = 112905^2 + 85226^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011010101 - 2⁷ = 20011009973 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 (20011010161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 863400 + ... + 886273.

It is an arithmetic number, because the mean of its divisors is an integer number (5003192803).

Almost surely, 2^20011010101 is an apocalyptic number.

It is an amenable number.

20011010101 is a deficient number, since it is larger than the sum of its proper divisors (1761111).

20011010101 is a wasteful number, since it uses less digits than its factorization.

20011010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761110.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 20011010101 its reverse (10101011002), we get a palindrome (30112021103).

Subtracting from 20011010101 its reverse (10101011002), we obtain a palindrome (9909999099).

The spelling of 20011010101 in words is "twenty billion, eleven million, ten thousand, one hundred one".