20012101 has 2 divisors, whose sum is σ = 20012102. Its totient is φ = 20012100.

The previous prime is 20012099. The next prime is 20012119. The reversal of 20012101 is 10121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19448100 + 564001 = 4410^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012101 - 2¹ = 20012099 is a prime.

Together with 20012099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006050 + 10006051.

It is an arithmetic number, because the mean of its divisors is an integer number (10006051).

Almost surely, 2^20012101 is an apocalyptic number.

It is an amenable number.

20012101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012101 is an equidigital number, since it uses as much as digits as its factorization.

20012101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 20012101 is about 4473.4886833432. The cubic root of 20012101 is about 271.4964959013.

Adding to 20012101 its reverse (10121002), we get a palindrome (30133103).

The spelling of 20012101 in words is "twenty million, twelve thousand, one hundred one".