201442142021 has 4 divisors (see below), whose sum is σ = 201443180844. Its totient is φ = 201441103200.

The previous prime is 201442142009. The next prime is 201442142047. The reversal of 201442142021 is 120241244102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 56727330625 + 144714811396 = 238175^2 + 380414^2 .

It is a cyclic number.

It is not a de Polignac number, because 201442142021 - 2²² = 201437947717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201442142051) 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, 132440 + ... + 648401.

It is an arithmetic number, because the mean of its divisors is an integer number (50360795211).

Almost surely, 2^201442142021 is an apocalyptic number.

It is an amenable number.

201442142021 is a deficient number, since it is larger than the sum of its proper divisors (1038823).

201442142021 is an equidigital number, since it uses as much as digits as its factorization.

201442142021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038822.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 201442142021 its reverse (120241244102), we get a palindrome (321683386123).

The spelling of 201442142021 in words is "two hundred one billion, four hundred forty-two million, one hundred forty-two thousand, twenty-one".