4542247142821 has 2 divisors, whose sum is σ = 4542247142822. Its totient is φ = 4542247142820.

The previous prime is 4542247142819. The next prime is 4542247142891. The reversal of 4542247142821 is 1282417422454.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4447096486596 + 95150656225 = 2108814^2 + 308465^2 .

It is a cyclic number.

It is not a de Polignac number, because 4542247142821 - 2¹ = 4542247142819 is a prime.

Together with 4542247142819, 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 (4542247142891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2271123571410 + 2271123571411.

It is an arithmetic number, because the mean of its divisors is an integer number (2271123571411).

Almost surely, 2^{4542247142821} is an apocalyptic number.

It is an amenable number.

4542247142821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4542247142821 is an equidigital number, since it uses as much as digits as its factorization.

4542247142821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1146880, while the sum is 46.

The spelling of 4542247142821 in words is "four trillion, five hundred forty-two billion, two hundred forty-seven million, one hundred forty-two thousand, eight hundred twenty-one".