20011002101 has 2 divisors, whose sum is σ = 20011002102. Its totient is φ = 20011002100.

The previous prime is 20011002097. The next prime is 20011002173. The reversal of 20011002101 is 10120011002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18926880625 + 1084121476 = 137575^2 + 32926^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011002101 - 2² = 20011002097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011002701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005501050 + 10005501051.

It is an arithmetic number, because the mean of its divisors is an integer number (10005501051).

Almost surely, 2^20011002101 is an apocalyptic number.

It is an amenable number.

20011002101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011002101 is an equidigital number, since it uses as much as digits as its factorization.

20011002101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20011002101 its reverse (10120011002), we get a palindrome (30131013103).

It can be divided in two parts, 20011002 and 101, that multiplied together give a palindrome (2021111202).

The spelling of 20011002101 in words is "twenty billion, eleven million, two thousand, one hundred one".