542347742221 has 2 divisors, whose sum is σ = 542347742222. Its totient is φ = 542347742220.

The previous prime is 542347742203. The next prime is 542347742267. The reversal of 542347742221 is 122247743245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 472675500196 + 69672242025 = 687514^2 + 263955^2 .

It is a cyclic number.

It is not a de Polignac number, because 542347742221 - 2¹⁹ = 542347217933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542347742281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271173871110 + 271173871111.

It is an arithmetic number, because the mean of its divisors is an integer number (271173871111).

Almost surely, 2^542347742221 is an apocalyptic number.

It is an amenable number.

542347742221 is a deficient number, since it is larger than the sum of its proper divisors (1).

542347742221 is an equidigital number, since it uses as much as digits as its factorization.

542347742221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 43.

The spelling of 542347742221 in words is "five hundred forty-two billion, three hundred forty-seven million, seven hundred forty-two thousand, two hundred twenty-one".