420300142021 has 2 divisors, whose sum is σ = 420300142022.
Its totient is φ = 420300142020.
The previous prime is 420300142019. The next prime is 420300142049. The reversal of 420300142021 is 120241003024.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 277608856996 + 142691285025 = 526886^2 + 377745^2
It is a cyclic number.
It is not a de Polignac number, because 420300142021 - 21 = 420300142019 is a prime.
Together with 420300142019, it forms a pair of twin primes.
It is a self number, because there is not a number n which added to its sum of digits gives 420300142021.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (420300142051) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210150071010 + 210150071011.
It is an arithmetic number, because the mean of its divisors is an integer number (210150071011).
Almost surely, 2420300142021 is an apocalyptic number.
It is an amenable number.
420300142021 is a deficient number, since it is larger than the sum of its proper divisors (1).
420300142021 is an equidigital number, since it uses as much as digits as its factorization.
420300142021 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 384, while the sum is 19.
Adding to 420300142021 its reverse (120241003024), we get a palindrome (540541145045).
The spelling of 420300142021 in words is "four hundred twenty billion, three hundred million, one hundred forty-two thousand, twenty-one".