102542120203021 has 2 divisors, whose sum is σ = 102542120203022. Its totient is φ = 102542120203020.

The previous prime is 102542120203007. The next prime is 102542120203031. The reversal of 102542120203021 is 120302021245201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82192899960900 + 20349220242121 = 9066030^2 + 4511011^2 .

It is a cyclic number.

It is not a de Polignac number, because 102542120203021 - 2²⁹ = 102541583332109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102542120203031) 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, 51271060101510 + 51271060101511.

It is an arithmetic number, because the mean of its divisors is an integer number (51271060101511).

Almost surely, 2^{102542120203021} is an apocalyptic number.

It is an amenable number.

102542120203021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102542120203021 is an equidigital number, since it uses as much as digits as its factorization.

102542120203021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 102542120203021 its reverse (120302021245201), we get a palindrome (222844141448222).

The spelling of 102542120203021 in words is "one hundred two trillion, five hundred forty-two billion, one hundred twenty million, two hundred three thousand, twenty-one".