20042101 has 2 divisors, whose sum is σ = 20042102. Its totient is φ = 20042100.

The previous prime is 20042059. The next prime is 20042107. The reversal of 20042101 is 10124002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18054001 + 1988100 = 4249^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 20042101 - 2²³ = 11653493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20042107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021050 + 10021051.

It is an arithmetic number, because the mean of its divisors is an integer number (10021051).

Almost surely, 2^20042101 is an apocalyptic number.

It is an amenable number.

20042101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042101 is an equidigital number, since it uses as much as digits as its factorization.

20042101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20042101 is about 4476.8405153635. The cubic root of 20042101 is about 271.6320943288.

Adding to 20042101 its reverse (10124002), we get a palindrome (30166103).

The spelling of 20042101 in words is "twenty million, forty-two thousand, one hundred one".